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java.util.ConcurrentModificationException: 	at java.util.TreeMap$MapIterator.stepForward(TreeMap.java:883)	at java.util.TreeMap$BoundedMap$BoundedIterator.stepForward(TreeMap.java:1485)	at java.util.TreeMap$BoundedMap$BoundedEntrySet$1.next(TreeMap.java:1513)	at java.util.TreeMap$BoundedMap$BoundedEntrySet$1.next(TreeMap.java:1511)	at org.achartengine.chart.XYChart.draw(XYChart.java:250)	at org.achartengine.GraphicalView.onDraw(GraphicalView.java:166)	at android.view.View.draw(View.java:13458)	at android.view.View.draw(View.java:13342)	at android.view.ViewGroup.drawChild(ViewGroup.java:2929)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799)	at android.view.View.draw(View.java:13340)	at android.view.ViewGroup.drawChild(ViewGroup.java:2929)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799)	at android.view.View.draw(View.java:13340)	at android.view.ViewGroup.drawChild(ViewGroup.java:2929)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799)	at android.view.View.draw(View.java:13461)	at android.widget.FrameLayout.draw(FrameLayout.java:467)	at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2183)	at android.view.ViewRootImpl.drawSoftware(ViewRootImpl.java:2256)	at android.view.ViewRootImpl.draw(ViewRootImpl.java:2151)	at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2019)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1830)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)	at android.view.Choreographer.doCallbacks(Choreographer.java:555)	at android.view.Choreographer.doFrame(Choreographer.java:525)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)	at android.os.Handler.handleCallback(Handler.java:615)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:4745)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)	at dalvik.system.NativeStart.main(Native Method)