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Attempt to invoke interface method 'int com.demo.mpchart.IBarDataSet.getBarBorderColor()' on a null object reference
java.lang.NullPointerException: Attempt to invoke interface method 'int com.demo.mpchart.IBarDataSet.getBarBorderColor()' on a null object reference	at com.demo.mpchart.BarChartRenderer.drawDataSet(BarChartRenderer.java:114)	at com.demo.mpchart.BarChartRenderer.drawData(BarChartRenderer.java:77)	at com.smartbro.mpchart.BarLineChartBase.onDraw(BarLineChartBase.java:217)	at android.view.View.draw(View.java:17134)	at android.view.View.updateDisplayListIfDirty(View.java:16116)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.updateDisplayListIfDirty(View.java:16111)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.draw(View.java:17137)	at android.view.View.updateDisplayListIfDirty(View.java:16116)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.draw(View.java:17137)	at android.view.View.updateDisplayListIfDirty(View.java:16116)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.updateDisplayListIfDirty(View.java:16111)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.draw(View.java:17137)	at android.widget.ScrollView.draw(ScrollView.java:1735)	at android.view.View.updateDisplayListIfDirty(View.java:16116)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.draw(View.java:17137)	at android.support.v4.view.ViewPager.draw(ViewPager.java:2259)	at android.view.View.updateDisplayListIfDirty(View.java:16116)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.draw(View.java:17137)	at android.view.View.updateDisplayListIfDirty(View.java:16116)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.support.v4.widget.DrawerLayout.drawChild(DrawerLayout.java:1229)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.updateDisplayListIfDirty(View.java:16111)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.updateDisplayListIfDirty(View.java:16111)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.updateDisplayListIfDirty(View.java:16111)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.updateDisplayListIfDirty(View.java:16111)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.updateDisplayListIfDirty(View.java:16111)	at android.view.View.draw(View.java:16900)	at android.view.ViewGroup.drawChild(ViewGroup.java:3764)	at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)	at android.view.View.draw(View.java:17137)	at com.android.internal.policy.DecorView.draw(DecorView.java:751)	at android.view.View.updateDisplayListIfDirty(View.java:16116)	at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:656)	at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:662)	at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:770)	at android.view.ViewRootImpl.draw(ViewRootImpl.java:2830)	at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2638)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2245)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1272)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6396)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)	at android.view.Choreographer.doCallbacks(Choreographer.java:683)	at android.view.Choreographer.doFrame(Choreographer.java:619)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)	at android.os.Handler.handleCallback(Handler.java:751)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:154)	at android.app.ActivityThread.main(ActivityThread.java:6209)	at java.lang.reflect.Method.invoke(Method.java)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)