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This exception has no message.
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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:787)	at java.util.HashMap$KeyIterator.next(HashMap.java:814)	at com.google.appinventor.components.runtime.EventDispatcher.delegateDispatchEvent(EventDispatcher.java:219)	at com.google.appinventor.components.runtime.EventDispatcher.dispatchEvent(EventDispatcher.java:198)	at com.google.appinventor.components.runtime.Button.Click(Button.java:51)	at com.google.appinventor.components.runtime.Button.click(Button.java:43)	at com.google.appinventor.components.runtime.ButtonBase.onClick(ButtonBase.java:656)	at android.view.View.performClick(View.java:4780)	at android.view.View$PerformClick.run(View.java:19866)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5254)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)