java.util.ConcurrentModificationException: This exception has no message.

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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$1.next(TreeMap.java:1513)
at org.achartengine.chart.XYChart.draw(XYChart.java:250)
at org.achartengine.GraphicalView.onDraw(GraphicalView.java:166)
at android.view.View.draw(View.java:13458)
at android.view.View.draw(View.java:13342)
at android.view.ViewGroup.drawChild(ViewGroup.java:2929)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799)
at android.view.View.draw(View.java:13340)
at android.view.ViewGroup.drawChild(ViewGroup.java:2929)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799)
at android.view.View.draw(View.java:13340)
at android.view.ViewGroup.drawChild(ViewGroup.java:2929)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2799)
at android.view.View.draw(View.java:13461)
at android.widget.FrameLayout.draw(FrameLayout.java:467)
at android.view.ViewRootImpl.drawSoftware(ViewRootImpl.java:2256)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2151)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2019)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1830)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)
at android.view.ViewRootImpl$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)

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