My app crash but i dont know why, no method named Column

[ewpatton]

Is there a specific error message you see when the app crashes?

[sams_sams]

No they aren’t specific message juste this in my phone

I have this if you would like "java.lang.RuntimeException: Unable to start activity ComponentInfo{appinventor.ai_samsvr75.robot/appinventor.ai_samsvr75.robot.Screen1}: java.lang.RuntimeException: invoke: no method named Column' in class appinventor.ai_samsvr75.robot.Screen1 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3304) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3443) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2040) at android.os.Handler.dispatchMessage(Handler.java:107) at android.os.Looper.loop(Looper.java:224) at android.app.ActivityThread.main(ActivityThread.java:7520) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950) Caused by: java.lang.RuntimeException: invoke: no method named Column’ in class appinventor.ai_samsvr75.robot.Screen1
at gnu.kawa.reflect.Invoke.lookupMethods(Invoke.java:284)
at gnu.kawa.reflect.Invoke.applyN(Invoke.java:185)
at gnu.mapping.ProcedureN.apply3(ProcedureN.java:48)
at com.google.youngandroid.runtime.$PcSetAndCoerceProperty$Ex(runtime6008596493896806739.scm:1282)
at com.google.youngandroid.runtime.setAndCoerceProperty$Ex(runtime6008596493896806739.scm:196)
at appinventor.ai_samsvr75.robot.Screen1.lambda5(Screen1.yail:13)
at appinventor.ai_samsvr75.robot.Screen1$frame.apply0(Screen1.yail:530)
at gnu.expr.ModuleMethod.apply0(ModuleMethod.java:186)
at kawa.lang.Promise.force(Promise.java:27)
at kawa.lang.Promise.force(Promise.java:37)
at kawa.lib.misc.force(misc.scm:98)
at appinventor.ai_samsvr75.robot.Screen1.$define(Screen1.yail:10312)
at com.google.appinventor.components.runtime.Form.onCreateFinish2(Form.java:415)
at com.google.appinventor.components.runtime.Form.onCreateFinish(Form.java:392)
at com.google.appinventor.components.runtime.Form.onCreate(Form.java:324)
at appinventor.ai_samsvr75.robot.Screen1.onCreate(Screen1.yail:10003)
at android.app.Activity.performCreate(Activity.java:7893)
at android.app.Activity.performCreate(Activity.java:7880)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3279)
… 11 more
"

[Taifun]

@sams_sams

no method named Column’ in class appinventor.ai_samsvr75.robot.Screen1

See here

Newbie here...need a little help invoke: no method named `Column' in class edu.mit.appinventor

I keep getting this message " invoke: no method named `Column’ in class edu.mit.appinventor" I have tried eliminating all blocks thinking the problem was there but to no avail. Any help is greatly appreciated.

Taifun

[sams_sams]

Taifun sorry I haven’t understand how you resolve this error and what caused this error

[Taifun]

this seems to be a bug in App Inventor...
as workaround did you try the solution by @Svetlana_GREGOIRE ?

Newbie here...need a little help invoke: no method named `Column' in class edu.mit.appinventor

Hello, I have the same problem and i fix it. 1.export the bad project 2 create a copy 3. rename your bad project to a *.zip and open the zip, open src/appinventor… to the end. you have 2 files, if you have one screen (Screen1.scm and Screen1.bky) extract Screen1.scm and open it with notepad++ 4. there is a line code in the beginning like that : {“authURL”:[“ai2.appinventor.mit.edu”],“YaVersion”:“205”,“Source”:“Form”,“Properties”:{"$Name":“Screen1”,"$Type":“Form”,"$Version":“27”,“AppName”…

Taifun

[sams_sams]

#|
$JSON
{“authURL”:[“ai2.appinventor.mit.edu”],“YaVersion”:“205”,“Source”:“Form”,“Properties”:{"$Name":“Screen1”,"$Type":“Form”,"$Version":“27”,“AppName”:“robot”,“Column”:“1”,“Row”:“1”,“Title”:“Screen1”,“Uuid”:“0”,"$Components":[{"$Name":“Arrangement_tableau1”,"$Type":“TableArrangement”,"$Version":“1”,“Columns”:“6”,“Width”:"-2",“Uuid”:“985901136”,"$Components":[{"$Name":“Etat”,"$Type":“Label”,"$Version":“5”,“Column”:“0”,“Row”:“0”,“Text”:“Etat :”,“Uuid”:"-1387751470"},{"$Name":“co”,"$Type":“Label”,"$Version":“5”,“Column”:“1”,“Row”:“0”,“Uuid”:"-960348748"},{"$Name":“Ebatterie”,"$Type":“Label”,"$Version":“5”,“Column”:“3”,“Row”:“0”,“Text”:“Batterie :”,“Uuid”:"-1228674089"},{"$Name":“Batterie”,"$Type":“Label”,"$Version":“5”,“Column”:“4”,“Row”:“0”,“Uuid”:“977694379”},{"$Name":“deconnection”,"$Type":“Button”,"$Version":“6”,“Column”:“3”,“Row”:“1”,“Text”:“deconnection”,“Uuid”:"-1851912711"},{"$Name":“vmd”,"$Type":“Label”,"$Version":“5”,“Column”:“2”,“Row”:“3”,“Uuid”:"-894039875"},{"$Name":“vmg”,"$Type":“Label”,"$Version":“5”,“Column”:“2”,“Row”:“5”,“Uuid”:"-726635850"},{"$Name":“connection”,"$Type":“ListPicker”,"$Version":“9”,“Column”:“2”,“Row”:“1”,“Text”:“connection”,“Uuid”:"-870570422"},{"$Name":“arret”,"$Type":“Button”,"$Version":“6”,“Column”:“4”,“Width”:"-1030",“Row”:“1”,“Text”:“arret moteur”,“Uuid”:“1000158394”}]},{"$Name":“Arrangement_tableau2”,"$Type":“TableArrangement”,"$Version":“1”,“Columns”:“3”,“Width”:"-2",“Rows”:“6”,“Uuid”:“1291129732”,"$Components":[{"$Name":“Label1”,"$Type":“Label”,"$Version":“5”,“Column”:“0”,“Row”:“0”,“Text”:“Moteurs droit :”,“Uuid”:“634718812”},{"$Name":“Arrangement_tableau3”,"$Type":“TableArrangement”,"$Version":“1”,“Column”:“1”,“Columns”:“4”,“Row”:“0”,“Rows”:“1”,“Uuid”:“635827793”,"$Components":[{"$Name":“sd”,"$Type":“Label”,"$Version":“5”,“Column”:“0”,“Row”:“0”,“Uuid”:"-1229781157"},{"$Name":“cd”,"$Type":“Label”,"$Version":“5”,“Column”:“1”,“Row”:“0”,“Uuid”:“10469080”},{"$Name":“dd”,"$Type":“Label”,"$Version":“5”,“Column”:“2”,“Row”:“0”,“Uuid”:"-291600816"},{"$Name":“ud”,"$Type":“Label”,"$Version":“5”,“Column”:“3”,“Row”:“0”,“Uuid”:"-1326192454"}]},{"$Name":“Label2”,"$Type":“Label”,"$Version":“5”,“Column”:“0”,“Row”:“3”,“Text”:“Moteur gauche : “,“Uuid”:”-832205646”},{"$Name":“Arrangement_tableau4”,"$Type":“TableArrangement”,"$Version":“1”,“Column”:“1”,“Columns”:“4”,“Row”:“3”,“Rows”:“1”,“Uuid”:"-1828745246","$Components":[{"$Name":“sg”,"$Type":“Label”,"$Version":“5”,“Column”:“0”,“Row”:“0”,“Uuid”:"-496760350"},{"$Name":“cg”,"$Type":“Label”,"$Version":“5”,“Column”:“1”,“Row”:“0”,“Uuid”:“1794373761”},{"$Name":“dg”,"$Type":“Label”,"$Version":“5”,“Column”:“2”,“Row”:“0”,“Uuid”:"-1140247932"},{"$Name":“ug”,"$Type":“Label”,"$Version":“5”,“Column”:“3”,“Row”:“0”,“Uuid”:“1846278606”}]},{"$Name":“md”,"$Type":“Slider”,"$Version":“2”,“Column”:“1”,“Width”:"-1070",“MaxValue”:“100”,“MinValue”:“0”,“Row”:“2”,“ThumbPosition”:“0”,“Uuid”:“139885953”},{"$Name":“mg”,"$Type":“Slider”,"$Version":“2”,“Column”:“1”,“Width”:"-1070",“MaxValue”:“100”,“MinValue”:“0”,“Row”:“5”,“ThumbPosition”:“0”,“Uuid”:“889571283”},{"$Name":“Label3”,"$Type":“Label”,"$Version":“5”,“Column”:“0”,“Width”:"-1010",“Row”:“1”,“Text”:“sens “,“Uuid”:”-221616109”},{"$Name":“Label4”,"$Type":“Label”,"$Version":“5”,“Column”:“0”,“Row”:“2”,“Text”:“vitesse”,“Uuid”:"-1568945932"},{"$Name":“Label5”,"$Type":“Label”,"$Version":“5”,“Column”:“0”,“Row”:“4”,“Text”:“sens”,“Uuid”:“1432635369”},{"$Name":“Label6”,"$Type":“Label”,"$Version":“5”,“Column”:“0”,“Row”:“5”,“Text”:“vitesse”,“Uuid”:“1930377131”},{"$Name":“HorizontalArrangement1”,"$Type":“HorizontalArrangement”,"$Version":“3”,“AlignHorizontal”:“3”,“Column”:“1”,“Row”:“1”,“Uuid”:"-1283631342","$Components":[{"$Name":“Switch1”,"$Type":“Switch”,"$Version":“1”,“On”:“True”,“Uuid”:“2079010972”}]},{"$Name":“HorizontalArrangement2”,"$Type":“HorizontalArrangement”,"$Version":“3”,“AlignHorizontal”:“3”,“Column”:“1”,“Row”:“4”,“Uuid”:"-2077624732","$Components":[{"$Name":“Switch2”,"$Type":“Switch”,"$Version":“1”,“Column”:“1”,“On”:“True”,“Row”:“4”,“Uuid”:“1824718593”}]}]},{"$Name":“Client_Bluetooth1”,"$Type":“BluetoothClient”,"$Version":“6”,“Uuid”:“1252279552”}]}}
|#

this is my line in screen1.scm now what doing

[TIMAI2]

@sams_sams

#|
$JSON
{“authURL”:[“ai2.appinventor.mit.edu”],“YaVersion”:“205”,“Source”:“Form”,“Properties”:{"$Name":“Screen1”,"$Type":“Form”,"$Version":“27”,“AppName”:“robot”,“Column”:“1”,“Row”:“1”,“Title”:“Screen1”,“Uuid”:“0”,"$Components":[{"$Name":“Arrangement

Try removing the Column:1,Row:1 in the screen1 stanza

[sams_sams]

i dont arrive to rename my file in .aia

[TIMAI2]

I don’t understand what you mean? Can you download your aia project to your computer ? can you open this project with an unzip program? Can you edit the .scm file ? Can you save this edited file ? Can you then close your unzip program? can you then rename the aia project in your file manager ?

[sams_sams]

@TIMAI2

can you then rename the aia project in your file manager

i dont arrive to doing this

[TIMAI2]

But you do not tell us why? Have you closed the unzip program and any editing program used to edit the file?

[sams_sams]

i have this error if you woudlike i send my zip and aia

[sams_sams]

robot2.aia (7.3 KB)

[TIMAI2]

Try this

robot2_revised.aia (8.3 KB)

(you somehow managed to add an extra directory in your aia…)

[sams_sams]

i have this

[sams_sams]

is there posibilty compile aia into apk ?

[TIMAI2]

That won’t help you. I was able to open up the revised version of your aia on my system, and it works without error in companion. Have you refreshed your web browser connection to MIT AI2 ? Try also closing the browser and opening up again.