java.lang.NoClassDefFoundError: com.telerik.widget.chart.visualization.behaviors.ChartTooltipBehavior

[Xiaoming]

when I use ChartTooltipBehavior in a chart ,it occured this error.

dalvikvm﹕ Could not find class 'com.telerik.widget.chart.visualization.behaviors.ChartTooltipBehavior', referenced from method com.luckyxmobile.familyhealthtracker.provider.MainListViewItemAdapter.prepareChart
E/dalvikvm﹕ Could not find class 'com.telerik.android.primitives.widget.tooltip.contracts.DrawListener', referenced from method com.telerik.widget.chart.visualization.common.RadChartViewBase.onDraw
FATAL EXCEPTION: main
    java.lang.NoClassDefFoundError: com.telerik.widget.chart.visualization.behaviors.ChartTooltipBehavior​

My codes is :

RadCartesianChartView cartesianChart = (RadCartesianChartView) radCartesianChartView;
ChartTooltipBehavior tooltipBehavior = new ChartTooltipBehavior(mContext);
cartesianChart.getBehaviors().add(tooltipBehavior);​

[Xiaoming]

But I can see the Class ChartTooltipBehavior 

[Victor]

Hello Xiaoming,

Thanks for writing.
This usually happens because your android studio/eclise environment has become corrupted. You have to clean and build your project. Also if you're building with gradle do a gradle sync if it doesn't happen automatically.

As a last resort you can redownload the controls and recreate your project.

Regards,
Victor
Telerik