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java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available 01-14 07:33:10.669 2246-2246/com.push.ra1.cancel I/Choreographer? Skipped 70 frames! The application may be doing too much work on its main thread. 01-14 07:33:17.331 2246-2246/com.push.ra1.cancel I/Choreographer? Skipped 80 frames! The application may be doing too much work on its main thread. 01-14 07:33:23.327 2246-2246/com.push.ra1.cancel E/WindowManager? android.view.WindowLeaked: Activity com.push.ra1.cancel.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{1586a180 V.E..... R......D 0,0-684,232} that was originally added here	at android.view.ViewRootImpl.(ViewRootImpl.java:363)	at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:271)	at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)	at android.app.Dialog.show(Dialog.java:298)	at com.push.ra1.cancel.MainActivity$AsyncTaskPayment.onPreExecute(MainActivity.java:132)	at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:591)	at android.os.AsyncTask.execute(AsyncTask.java:539)	at com.push.ra1.cancel.MainActivity$2.onClick(MainActivity.java:63)	at android.view.View.performClick(View.java:4780)	at android.view.View$PerformClick.run(View.java:19866)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5257)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)