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java.util.ConcurrentModificationException: 	at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:569)	at com.nextgis.maplib.map.LayerGroup.cancelDraw(LayerGroup.java:297)	at com.nextgis.maplib.map.MapDrawable.cancelDraw(MapDrawable.java:318)	at com.nextgis.maplib.map.MapDrawable.runDraw(MapDrawable.java:278)	at com.nextgis.maplibui.mapui.MapView.drawMapDrawable(MapView.java:627)	at com.nextgis.maplibui.mapui.MapView.onLayerAdded(MapView.java:588)	at com.nextgis.maplib.map.MapEventSource$1.handleMessage(MapEventSource.java:314)	at android.os.Handler.dispatchMessage(Handler.java:99)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:5041)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)	at dalvik.system.NativeStart.main(Native Method)