Getting "Server error: could not add form. Please try again later! " when trying to add screen on locally running app inventor

MIT App Inventor Help
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1

I have setup App inventor using vagrant locally (windows 10). and I started the app inventor using start_appinventor command. it is accessible from localhost:8888 but when I try to add new screen it shows "Server error: could not add form. Please try again later!"

I checked the vagrant console and in console it has following error

java.io.FileNotFoundException: /vagrant/appinventor/appengine/build/war/WEB-INF/appengine-generated/encoded_gs_key:L2dzL2FwcF9kZWZhdWx0X2J1Y2tldC81NjI5NDk5NTM0MjEzMTIwL3NyYy9hcHBpbnZlbnRvci9haV9kZXZhcnNobWF2YW5pMTkvbXlfdGVzdF9wcm9qZWN0L1NjcmVlbjQuc2NtLjIwMjItMDEtMjRUMTc6MjY6MjQrMDAwMC5iYWNrdXA (Protocol error)
        at java.io.FileOutputStream.open0(Native Method)
        at java.io.FileOutputStream.open(FileOutputStream.java:270)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:213)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:162)
        at com.google.appengine.api.blobstore.dev.FileBlobStorage$2.run(FileBlobStorage.java:57)
        at com.google.appengine.api.blobstore.dev.FileBlobStorage$2.run(FileBlobStorage.java:54)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.google.appengine.api.blobstore.dev.FileBlobStorage.storeBlob(FileBlobStorage.java:54)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at com.google.appengine.tools.cloudstorage.dev.LocalRawGcsService$BlobStorageAdapter.storeBlob(LocalRawGcsService.java:153)
        at com.google.appengine.tools.cloudstorage.dev.LocalRawGcsService.finishObjectCreation(LocalRawGcsService.java:336)
        at com.google.appengine.tools.cloudstorage.GcsOutputChannelImpl$1.call(GcsOutputChannelImpl.java:201)
        at com.google.appengine.tools.cloudstorage.GcsOutputChannelImpl$1.call(GcsOutputChannelImpl.java:198)
        at com.google.appengine.tools.cloudstorage.RetryHelper.doRetry(RetryHelper.java:108)
        at com.google.appengine.tools.cloudstorage.RetryHelper.runWithRetries(RetryHelper.java:166)
        at com.google.appengine.tools.cloudstorage.RetryHelper.runWithRetries(RetryHelper.java:156)
        at com.google.appengine.tools.cloudstorage.GcsOutputChannelImpl.close(GcsOutputChannelImpl.java:198)
        at com.google.appinventor.server.storage.ObjectifyStorageIo$35.run(ObjectifyStorageIo.java:1462)
        at com.google.appinventor.server.storage.ObjectifyStorageIo.runJobWithRetries(ObjectifyStorageIo.java:2372)
        at com.google.appinventor.server.storage.ObjectifyStorageIo.uploadRawFile(ObjectifyStorageIo.java:1378)
        at com.google.appinventor.server.storage.ObjectifyStorageIo.uploadRawFile(ObjectifyStorageIo.java:1363)
        at com.google.appinventor.server.storage.ObjectifyStorageIo.uploadRawFileForce(ObjectifyStorageIo.java:1353)
        at com.google.appinventor.server.storage.ObjectifyStorageIo.uploadFileForce(ObjectifyStorageIo.java:1320)
        at com.google.appinventor.server.project.youngandroid.YoungAndroidProjectService.addFile(YoungAndroidProjectService.java:408)
        at com.google.appinventor.server.ProjectServiceImpl.addFile(ProjectServiceImpl.java:641)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:587)
        at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:333)
        at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:303)
        at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:373)
        at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1655)
        at com.google.appinventor.server.OdeAuthFilter.doMyFilter(OdeAuthFilter.java:188)
        at com.google.appinventor.server.OdeAuthFilter.doFilter(OdeAuthFilter.java:133)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:134)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.jetty9.StaticFileFilter.doFilter(StaticFileFilter.java:123)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
        at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
        at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.DevAppServerRequestLogFilter.doFilter(DevAppServerRequestLogFilter.java:44)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1340)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1242)
        at com.google.appengine.tools.development.jetty9.DevAppEngineWebAppContext.doScope(DevAppEngineWebAppContext.java:94)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at com.google.appengine.tools.development.jetty9.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:595)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.Server.handle(Server.java:503)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
        at java.lang.Thread.run(Thread.java:748)

Jan 24, 2022 5:26:24 PM com.google.appengine.tools.development.ApiProxyLocalImpl log
SEVERE: javax.servlet.ServletContext log: Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract long com.google.appinventor.shared.rpc.project.ProjectService.addFile(long,java.lang.String)' threw an unexpected exception: java.lang.RuntimeException: java.io.FileNotFoundException: /vagrant/appinventor/appengine/build/war/WEB-INF/appengine-generated/encoded_gs_key:L2dzL2FwcF9kZWZhdWx0X2J1Y2tldC81NjI5NDk5NTM0MjEzMTIwL3NyYy9hcHBpbnZlbnRvci9haV9kZXZhcnNobWF2YW5pMTkvbXlfdGVzdF9wcm9qZWN0L1NjcmVlbjQuc2NtLjIwMjItMDEtMjRUMTc6MjY6MjQrMDAwMC5iYWNrdXA (Protocol error)
        at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:416)
        at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:605)
        at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:333)
        at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:303)
        at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:373)
        at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1655)
        at com.google.appinventor.server.OdeAuthFilter.doMyFilter(OdeAuthFilter.java:188)
        at com.google.appinventor.server.OdeAuthFilter.doFilter(OdeAuthFilter.java:133)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:134)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.jetty9.StaticFileFilter.doFilter(StaticFileFilter.java:123)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
        at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
        at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.DevAppServerRequestLogFilter.doFilter(DevAppServerRequestLogFilter.java:44)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1340)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1242)
        at com.google.appengine.tools.development.jetty9.DevAppEngineWebAppContext.doScope(DevAppEngineWebAppContext.java:94)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at com.google.appengine.tools.development.jetty9.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:595)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.Server.handle(Server.java:503)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
        at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.RuntimeException: java.io.FileNotFoundException: /vagrant/appinventor/appengine/build/war/WEB-INF/appengine-generated/encoded_gs_key:L2dzL2FwcF9kZWZhdWx0X2J1Y2tldC81NjI5NDk5NTM0MjEzMTIwL3NyYy9hcHBpbnZlbnRvci9haV9kZXZhcnNobWF2YW5pMTkvbXlfdGVzdF9wcm9qZWN0L1NjcmVlbjQuc2NtLjIwMjItMDEtMjRUMTc6MjY6MjQrMDAwMC5iYWNrdXA (Protocol error)
        at com.google.appinventor.server.CrashReport.createAndLogError(CrashReport.java:47)
        at com.google.appinventor.server.storage.ObjectifyStorageIo$35.run(ObjectifyStorageIo.java:1465)
        at com.google.appinventor.server.storage.ObjectifyStorageIo.runJobWithRetries(ObjectifyStorageIo.java:2372)
        at com.google.appinventor.server.storage.ObjectifyStorageIo.uploadRawFile(ObjectifyStorageIo.java:1378)
        at com.google.appinventor.server.storage.ObjectifyStorageIo.uploadRawFile(ObjectifyStorageIo.java:1363)
        at com.google.appinventor.server.storage.ObjectifyStorageIo.uploadRawFileForce(ObjectifyStorageIo.java:1353)
        at com.google.appinventor.server.storage.ObjectifyStorageIo.uploadFileForce(ObjectifyStorageIo.java:1320)
        at com.google.appinventor.server.project.youngandroid.YoungAndroidProjectService.addFile(YoungAndroidProjectService.java:408)
        at com.google.appinventor.server.ProjectServiceImpl.addFile(ProjectServiceImpl.java:641)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:587)
        ... 59 more
Caused by: java.io.FileNotFoundException: /vagrant/appinventor/appengine/build/war/WEB-INF/appengine-generated/encoded_gs_key:L2dzL2FwcF9kZWZhdWx0X2J1Y2tldC81NjI5NDk5NTM0MjEzMTIwL3NyYy9hcHBpbnZlbnRvci9haV9kZXZhcnNobWF2YW5pMTkvbXlfdGVzdF9wcm9qZWN0L1NjcmVlbjQuc2NtLjIwMjItMDEtMjRUMTc6MjY6MjQrMDAwMC5iYWNrdXA (Protocol error)
        at java.io.FileOutputStream.open0(Native Method)
        at java.io.FileOutputStream.open(FileOutputStream.java:270)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:213)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:162)
        at com.google.appengine.api.blobstore.dev.FileBlobStorage$2.run(FileBlobStorage.java:57)
        at com.google.appengine.api.blobstore.dev.FileBlobStorage$2.run(FileBlobStorage.java:54)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.google.appengine.api.blobstore.dev.FileBlobStorage.storeBlob(FileBlobStorage.java:54)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at com.google.appengine.tools.cloudstorage.dev.LocalRawGcsService$BlobStorageAdapter.storeBlob(LocalRawGcsService.java:153)
        at com.google.appengine.tools.cloudstorage.dev.LocalRawGcsService.finishObjectCreation(LocalRawGcsService.java:336)
        at com.google.appengine.tools.cloudstorage.GcsOutputChannelImpl$1.call(GcsOutputChannelImpl.java:201)
        at com.google.appengine.tools.cloudstorage.GcsOutputChannelImpl$1.call(GcsOutputChannelImpl.java:198)
        at com.google.appengine.tools.cloudstorage.RetryHelper.doRetry(RetryHelper.java:108)
        at com.google.appengine.tools.cloudstorage.RetryHelper.runWithRetries(RetryHelper.java:166)
        at com.google.appengine.tools.cloudstorage.RetryHelper.runWithRetries(RetryHelper.java:156)
        at com.google.appengine.tools.cloudstorage.GcsOutputChannelImpl.close(GcsOutputChannelImpl.java:198)
        at com.google.appinventor.server.storage.ObjectifyStorageIo$35.run(ObjectifyStorageIo.java:1462)
        ... 71 more

Jan 24, 2022 5:26:36 PM com.google.appengine.api.datastore.dev.LocalDatastoreService$11 run
INFO: Time to persist datastore: 14 ms
Jan 24, 2022 5:30:34 PM com.google.appengine.tools.development.ApiProxyLocalImpl log
SEVERE: javax.servlet.ServletContext log: Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract long com.google.appinventor.shared.rpc.project.ProjectService.addFile(long,java.lang.String)' threw an unexpected exception: java.lang.IllegalStateException: One or more files to be added already exists.
        at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:416)
        at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:605)
        at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:333)
        at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:303)
        at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:373)
        at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1655)
        at com.google.appinventor.server.OdeAuthFilter.doMyFilter(OdeAuthFilter.java:188)
        at com.google.appinventor.server.OdeAuthFilter.doFilter(OdeAuthFilter.java:133)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:134)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:48)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.jetty9.StaticFileFilter.doFilter(StaticFileFilter.java:123)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
        at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
        at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
        at com.google.appengine.tools.development.DevAppServerRequestLogFilter.doFilter(DevAppServerRequestLogFilter.java:44)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1340)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1242)
        at com.google.appengine.tools.development.jetty9.DevAppEngineWebAppContext.doScope(DevAppEngineWebAppContext.java:94)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at com.google.appengine.tools.development.jetty9.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:595)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
        at org.eclipse.jetty.server.Server.handle(Server.java:503)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: One or more files to be added already exists.
        at com.google.appinventor.server.project.youngandroid.YoungAndroidProjectService.addFile(YoungAndroidProjectService.java:421)
        at com.google.appinventor.server.ProjectServiceImpl.addFile(ProjectServiceImpl.java:641)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:587)

Please help me what am I missing? I followed the readme to setup but I am stuck at this point.

2

This is because the Vagrant machine uses shared paths and is running in Linux, but the host system is Windows and Windows does not allow colons in filenames. Generally, I recommend that if you're planning to do any serious development on App Inventor you should set up your host environment to build App Inventor rather than rely on Vagrant. Build times are 2x or more slower when using the VM approach so you'll benefit greatly from investing the time up front to configure things correctly.

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3

Alright, thanks for sharing that. by the way which file has a colon in its name I can't figure that out

4

The entry in the App Engine Datastore is stored in Linux using the Base64 encoded name of the file prepended with encoded_gs_key:. Because the filesystem is shared with Windows things fail. In theory it would be possible to mount another file system like ext4 at appengine/build before building but I haven't tried this.

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