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Cannot execute task: the task has already been executed (a task can be executed only once)
java.lang.IllegalStateException: Cannot execute task: the task is already running.	at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:576)	at android.os.AsyncTask.execute(AsyncTask.java:535)	at com.emergency.e_place.WC_Activity.Upload(WC_Activity.java:153)	at com.emergency.e_place.WC_Activity$6.onClick(WC_Activity.java:196)	at android.support.v7.app.AlertController$ButtonHandler.handleMessage(AlertController.java:153)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:146)	at android.app.ActivityThread.main(ActivityThread.java:5511)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)	at dalvik.system.NativeStart.main(Native Method)