This kind of errors scares me, dont know where to begin....
B4X:
available Memory = 357.7372741699219 MB
No wakelock.
available Memory = 357.7372741699219 MB
java.lang.NoClassDefFoundError: Failed resolution of: Lkotlin/jvm/internal/Intrinsics;
at com.dropbox.core.android.Auth$Companion.startOAuth2Authentication(Unknown Source:2)
at com.dropbox.core.android.Auth.startOAuth2Authentication(Unknown Source:2)
at de.donmanfred.dbxv2.AuthWrapper.startOAuth2Authentication(AuthWrapper.java:35)
at com.tropic.invoice.main._btnrestoredropbox_click(main.java:47820)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:351)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:157)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:205)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:201)
at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
at android.view.View.performClick(View.java:7465)
at android.view.View.performClickInternal(View.java:7442)
at android.view.View.access$3600(View.java:813)
at android.view.View$PerformClick.run(View.java:28394)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:250)
at android.app.ActivityThread.main(ActivityThread.java:7803)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:958)
Caused by: java.lang.ClassNotFoundException: kotlin.jvm.internal.Intrinsics
... 24 more