10-05 16:44:14.425  29939-29939/tw.skyarrow.ehreader E/AndroidRuntime﹕ FATAL EXCEPTION: main
        java.lang.NullPointerException
        at tw.skyarrow.ehreader.activity.MainFragment.setProgressBarVisibility(MainFragment.java:92)
        at tw.skyarrow.ehreader.activity.MainFragmentWeb$GetGalleryListTask.onPostExecute(MainFragmentWeb.java:158)
        at tw.skyarrow.ehreader.activity.MainFragmentWeb$GetGalleryListTask.onPostExecute(MainFragmentWeb.java:68)
        at android.os.AsyncTask.finish(AsyncTask.java:631)
        at android.os.AsyncTask.access$600(AsyncTask.java:177)
        at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4931)
        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:791)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
        at dalvik.system.NativeStart.main(Native Method)