How to solve No module named 'rubicon' ?

[ikus060]

Hello,

I'm starting to test briefcase and I'm running into issue trying to run the application on Android.

Following the tutorial, I'm getting this error.

02-23 12:49:59.168  1780  1780 V Python  : Import rubicon...
02-23 12:49:59.168  1780  1780 E Python  : Couldn't import rubicon python module
02-23 12:49:59.168  1780  1780 E Python  : ModuleNotFoundError: No module named 'rubicon'
02-23 12:49:59.169  1780  1780 E MainActivity: Failed to create Python app
02-23 12:49:59.169  1780  1780 E MainActivity: java.lang.Exception: Unable to start Python interpreter.
02-23 12:49:59.169  1780  1780 E MainActivity:  at org.beeware.android.MainActivity.startPython(MainActivity.java:226)
02-23 12:49:59.169  1780  1780 E MainActivity:  at org.beeware.android.MainActivity.onCreate(MainActivity.java:249)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.app.Activity.performCreate(Activity.java:8051)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.app.Activity.performCreate(Activity.java:8031)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1329)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3608)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3792)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2210)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.os.Handler.dispatchMessage(Handler.java:106)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.os.Looper.loopOnce(Looper.java:201)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.os.Looper.loop(Looper.java:288)
02-23 12:49:59.169  1780  1780 E MainActivity:  at android.app.ActivityThread.main(ActivityThread.java:7839)
02-23 12:49:59.169  1780  1780 E MainActivity:  at java.lang.reflect.Method.invoke(Native Method)
02-23 12:49:59.169  1780  1780 E MainActivity:  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
02-23 12:49:59.169  1780  1780 E MainActivity:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
02-23 12:49:59.171  1780  1780 D MainActivity: onStart() start
02-23 12:49:59.171  1780  1780 D AndroidRuntime: Shutting down VM
--------- beginning of crash
02-23 12:49:59.171  1780  1780 E AndroidRuntime: FATAL EXCEPTION: main
02-23 12:49:59.171  1780  1780 E AndroidRuntime: Process: org.minarca.agent.minarca, PID: 1780
02-23 12:49:59.171  1780  1780 E AndroidRuntime: java.lang.NullPointerException: Attempt to invoke interface method 'void org.beeware.android.IPythonApp.onStart()' on a null object reference
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at org.beeware.android.MainActivity.onStart(MainActivity.java:263)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1455)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at android.app.Activity.performStart(Activity.java:8076)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3660)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2210)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:106)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at android.os.Looper.loopOnce(Looper.java:201)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:288)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at android.app.ActivityThread.main(ActivityThread.java:7839)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at java.lang.reflect.Method.invoke(Native Method)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
02-23 12:49:59.171  1780  1780 E AndroidRuntime:        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
02-23 12:49:59.205  1780  1780 I Process : Sending signal. PID: 1780 SIG: 9```

I'm not exactly sure if `rubicon` is indeed required for my project.

[rmartin16]

Please upload the full log file created by Briefcase; there's probably not enough information here to understand the root of the problem.

Nonetheless, it appears you're using outdated versions of BeeWare; Rubicon is no longer used to create Android apps.

[ikus060]

Good point, for unknown reason, I was running briefcase 0.3.9 instead of the latest version. Thanks for helping !