Extension build but not get aix file

can anyone help me to solve this problem.

ExternalComponentGenerator:
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\classes\ExternalComponentGenerator
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\externalComponents
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\externalComponents-class
    [javac] Compiling 1 source file to C:\appinventor-sources-master\appinventor\components\build\classes\ExternalComponentGenerator
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 7
    [javac] warning: [options] source value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] target value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
    [javac] 4 warnings
     [java] java.nio.file.NoSuchFileException: C:\appinventor-sources-master\appinventor\build\components\simple_components.json
     [java]     at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:194)
     [java]     at org.apache.tools.ant.taskdefs.Java.run(Java.java:861)
     [java]     at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:231)
     [java]     at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:135)
     [java]     at org.apache.tools.ant.taskdefs.Java.execute(Java.java:108)
     [java]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
     [java]     at jdk.internal.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
     [java]     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     [java]     at java.base/java.lang.reflect.Method.invoke(Method.java:564)
     [java]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:99)
     [java]     at org.apache.tools.ant.Task.perform(Task.java:350)
     [java]     at org.apache.tools.ant.Target.execute(Target.java:449)
     [java]     at org.apache.tools.ant.Target.performTasks(Target.java:470)
     [java]     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1391)
     [java]     at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:36)
     [java]     at org.apache.tools.ant.Project.executeTargets(Project.java:1254)
     [java]     at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:437)
     [java]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
     [java]     at jdk.internal.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
     [java]     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     [java]     at java.base/java.lang.reflect.Method.invoke(Method.java:564)
     [java]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:99)
     [java]     at org.apache.tools.ant.Task.perform(Task.java:350)
     [java]     at org.apache.tools.ant.Target.execute(Target.java:449)
     [java]     at org.apache.tools.ant.Target.performTasks(Target.java:470)
     [java]     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1391)
     [java]     at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
     [java]     at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
     [java]     at org.apache.tools.ant.Project.executeTargets(Project.java:1254)
     [java]     at org.apache.tools.ant.Main.runBuild(Main.java:830)
     [java]     at org.apache.tools.ant.Main.startAnt(Main.java:223)
     [java]     at org.apache.tools.ant.launch.Launcher.run(Launcher.java:284)
     [java]     at org.apache.tools.ant.launch.Launcher.main(Launcher.java:101)
     [java] Caused by: java.nio.file.NoSuchFileException: C:\appinventor-sources-master\appinventor\build\components\simple_components.json
     [java]     at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:85)
     [java]     at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103)
     [java]     at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108)
     [java]     at java.base/sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:235)
     [java]     at java.base/java.nio.file.Files.newByteChannel(Files.java:375)
     [java]     at java.base/java.nio.file.Files.newByteChannel(Files.java:426)
     [java]     at java.base/java.nio.file.Files.readAllBytes(Files.java:3272)
     [java]     at com.google.appinventor.components.scripts.ExternalComponentGenerator.readFile(ExternalComponentGenerator.java:291)
     [java]     at com.google.appinventor.components.scripts.ExternalComponentGenerator.main(ExternalComponentGenerator.java:50)
     [java]     at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [java]     at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
     [java]     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     [java]     at java.base/java.lang.reflect.Method.invoke(Method.java:564)
     [java]     at org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:218)
     [java]     at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:155)
     [java]     ... 32 more
     [java] Java Result: -1

unjarAllExtensionLibraries:

jarAllExtensions:

dexAllExtensions:

extensions:
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\extensions

BUILD SUCCESSFUL
Total time: 15 seconds

This is almost purely a guess:
java.nio.file.NoSuchFileException was Added in API level 26 Android OS Oreo v8.0.
I typically try not to target anything above API level 21 myself, I wonder if the API level being so high is causing some kind of issues.

https://developer.android.com/reference/java/nio/file/NoSuchFileException

so how can i fix it

but i am trying with simple math extension temp.

simple_components.json is created when the AndroidRuntime is built. Were there any errors in that step?

$ ant extensions
Buildfile: C:\appinventor-sources-master\appinventor\build.xml

extensions:

clean:
   [delete] Deleting directory C:\appinventor-sources-master\appinventor\build\components
   [delete] Deleting directory C:\appinventor-sources-master\appinventor\components\build
   [delete] Deleting directory C:\appinventor-sources-master\appinventor\components\reports

common_CommonVersion:

init:

CommonVersion:
     [exec] Result: 128
     [exec] Result: 128

init:
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\build\components
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\classes
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\reports
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\reports\raw
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\reports\html

HtmlEntities:
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\classes\HtmlEntities
    [javac] Compiling 1 source file to C:\appinventor-sources-master\appinventor\components\build\classes\HtmlEntities
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 7
    [javac] warning: [options] source value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] target value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
    [javac] 4 warnings
      [jar] Building jar: C:\appinventor-sources-master\appinventor\components\build\HtmlEntities.jar

Barcode:
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\classes\Barcode
    [javac] Compiling 40 source files to C:\appinventor-sources-master\appinventor\components\build\classes\Barcode
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 7
    [javac] warning: [options] source value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] target value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] Note: Some input files use unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 4 warnings
      [jar] Building jar: C:\appinventor-sources-master\appinventor\build\components\deps\Barcode.jar

CopyComponentLibraries:
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps\armeabi-v7a
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps\arm64-v8a
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps\x86_64
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 57 files to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 2 files to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps
     [copy] Copying 1 file to C:\appinventor-sources-master\appinventor\build\components\deps

common_CommonUtils:

init:

CommonUtils:

CommonConstants:
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\classes\CommonConstants
    [javac] Compiling 7 source files to C:\appinventor-sources-master\appinventor\components\build\classes\CommonConstants
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 7
    [javac] warning: [options] source value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] target value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
    [javac] 4 warnings
    [javac] Creating empty C:\appinventor-sources-master\appinventor\components\build\classes\CommonConstants\com\google\appinventor\components\common\package-info.class
      [jar] Building jar: C:\appinventor-sources-master\appinventor\build\components\CommonConstants.jar
      [jar] Building jar: C:\appinventor-sources-master\appinventor\build\components\CommonConstants-gwt.jar

AnnotationProcessors:
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\classes\AnnotationProcessors
    [javac] Compiling 33 source files to C:\appinventor-sources-master\appinventor\components\build\classes\AnnotationProcessors
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 7
    [javac] warning: [options] source value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] target value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
    [javac] Note: C:\appinventor-sources-master\appinventor\components\src\com\google\appinventor\components\scripts\ComponentProcessor.java uses or overrides a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] Note: C:\appinventor-sources-master\appinventor\components\src\com\google\appinventor\components\scripts\ComponentProcessor.java uses unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 4 warnings
    [javac] Creating empty C:\appinventor-sources-master\appinventor\components\build\classes\AnnotationProcessors\com\google\appinventor\components\annotations\androidmanifest\package-info.class
    [javac] Creating empty C:\appinventor-sources-master\appinventor\components\build\classes\AnnotationProcessors\com\google\appinventor\components\annotations\package-info.class
    [javac] Creating empty C:\appinventor-sources-master\appinventor\components\build\classes\AnnotationProcessors\com\google\appinventor\components\scripts\package-info.class
     [copy] Copying 22 files to C:\appinventor-sources-master\appinventor\components\build\classes\AnnotationProcessors
      [jar] Building jar: C:\appinventor-sources-master\appinventor\components\build\AnnotationProcessors.jar

AndroidRuntime.uptodate:

AndroidRuntime:
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\classes\AndroidRuntime
    [javac] Compiling 282 source files to C:\appinventor-sources-master\appinventor\components\build\classes\AndroidRuntime
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 7
    [javac] warning: [options] source value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] target value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] Note: Some input files use unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 4 warnings
    [javac] Creating empty C:\appinventor-sources-master\appinventor\components\build\classes\AndroidRuntime\com\google\appinventor\components\runtime\util\package-info.class
    [javac] Creating empty C:\appinventor-sources-master\appinventor\components\build\classes\AndroidRuntime\com\google\appinventor\components\annotations\androidmanifest\package-info.class
    [javac] Creating empty C:\appinventor-sources-master\appinventor\components\build\classes\AndroidRuntime\com\google\appinventor\components\runtime\collect\package-info.class
    [javac] Creating empty C:\appinventor-sources-master\appinventor\components\build\classes\AndroidRuntime\com\google\appinventor\components\annotations\package-info.class
    [javac] Creating empty C:\appinventor-sources-master\appinventor\components\build\classes\AndroidRuntime\com\google\appinventor\components\runtime\package-info.class
    [javac] Creating empty C:\appinventor-sources-master\appinventor\components\build\classes\AndroidRuntime\com\google\appinventor\components\runtime\errors\package-info.class
      [jar] Building jar: C:\appinventor-sources-master\appinventor\build\components\AndroidRuntime.jar
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\build\components\ComponentTranslation\src\com\google\appinventor\client

ExternalComponentGenerator:
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\classes\ExternalComponentGenerator
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\externalComponents
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\externalComponents-class
    [javac] Compiling 1 source file to C:\appinventor-sources-master\appinventor\components\build\classes\ExternalComponentGenerator
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 7
    [javac] warning: [options] source value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] target value 7 is obsolete and will be removed in a future release
    [javac] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
    [javac] 4 warnings
     [java] java.nio.file.NoSuchFileException: C:\appinventor-sources-master\appinventor\build\components\simple_components.json
     [java]     at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:194)
     [java]     at org.apache.tools.ant.taskdefs.Java.run(Java.java:861)
     [java]     at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:231)
     [java]     at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:135)
     [java]     at org.apache.tools.ant.taskdefs.Java.execute(Java.java:108)
     [java]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
     [java]     at jdk.internal.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
     [java]     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     [java]     at java.base/java.lang.reflect.Method.invoke(Method.java:564)
     [java]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:99)
     [java]     at org.apache.tools.ant.Task.perform(Task.java:350)
     [java]     at org.apache.tools.ant.Target.execute(Target.java:449)
     [java]     at org.apache.tools.ant.Target.performTasks(Target.java:470)
     [java]     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1391)
     [java]     at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:36)
     [java]     at org.apache.tools.ant.Project.executeTargets(Project.java:1254)
     [java]     at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:437)
     [java]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
     [java]     at jdk.internal.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
     [java]     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     [java]     at java.base/java.lang.reflect.Method.invoke(Method.java:564)
     [java]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:99)
     [java]     at org.apache.tools.ant.Task.perform(Task.java:350)
     [java]     at org.apache.tools.ant.Target.execute(Target.java:449)
     [java]     at org.apache.tools.ant.Target.performTasks(Target.java:470)
     [java]     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1391)
     [java]     at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
     [java]     at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
     [java]     at org.apache.tools.ant.Project.executeTargets(Project.java:1254)
     [java]     at org.apache.tools.ant.Main.runBuild(Main.java:830)
     [java]     at org.apache.tools.ant.Main.startAnt(Main.java:223)
     [java]     at org.apache.tools.ant.launch.Launcher.run(Launcher.java:284)
     [java]     at org.apache.tools.ant.launch.Launcher.main(Launcher.java:101)
     [java] Caused by: java.nio.file.NoSuchFileException: C:\appinventor-sources-master\appinventor\build\components\simple_components.json
     [java]     at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:85)
     [java]     at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103)
     [java]     at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108)
     [java]     at java.base/sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:235)
     [java]     at java.base/java.nio.file.Files.newByteChannel(Files.java:375)
     [java]     at java.base/java.nio.file.Files.newByteChannel(Files.java:426)
     [java]     at java.base/java.nio.file.Files.readAllBytes(Files.java:3272)
     [java]     at com.google.appinventor.components.scripts.ExternalComponentGenerator.readFile(ExternalComponentGenerator.java:291)
     [java]     at com.google.appinventor.components.scripts.ExternalComponentGenerator.main(ExternalComponentGenerator.java:50)
     [java]     at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [java]     at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
     [java]     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     [java]     at java.base/java.lang.reflect.Method.invoke(Method.java:564)
     [java]     at org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:218)
     [java]     at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:155)
     [java]     ... 32 more
     [java] Java Result: -1

unjarAllExtensionLibraries:

jarAllExtensions:

dexAllExtensions:

extensions:
    [mkdir] Created dir: C:\appinventor-sources-master\appinventor\components\build\extensions

BUILD SUCCESSFUL
Total time: 20 seconds

see this full report

What is the last commit you have since master? You can get this by running:

git merge-base HEAD master

In the AndroidRuntime step you should see information about it writing simple_components.json, among others. I don’t see that in your output though.