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java.lang.NullPointerException: 	at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:142)	at android.app.AlertDialog.(AlertDialog.java:98)	at android.app.ProgressDialog.(ProgressDialog.java:77)	at com.eeshana.android_29042014.AsynkTask.GuestLoginSenderAskTask.onPreExecute(GuestLoginSenderAskTask.java:72)	at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)	at android.os.AsyncTask.execute(AsyncTask.java:534)	at com.eeshana.android_04012014.checkthisapp.LoginScreen.callGuestLoginThread(LoginScreen.java:138)	at com.eeshana.android_04012014.checkthisapp.LoginScreen.onClick(LoginScreen.java:104)	at android.view.View.performClick(View.java:4084)	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)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)	at dalvik.system.NativeStart.main(Native Method)