java.lang.NoClassDefFoundError: android.icu.util.Calendar***

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java.lang.NoClassDefFoundError: android.icu.util.Calendar***
at com.example.panwa.afinal.MainActivity.startAt10(MainActivity.java:70)
at com.example.panwa.afinal.MainActivity$3.onClick(MainActivity.java:46)
at android.view.View.performClick(View.java:4275)
at android.view.View$PerformClick.run(View.java:17434)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:177)
at android.app.ActivityThread.main(ActivityThread.java:4947)
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:1038)

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