о чем может говорить этот лог

06-23 13:11:27.181: E/AndroidRuntime(523): FATAL EXCEPTION: main
06-23 13:11:27.181: E/AndroidRuntime(523): java.lang.NullPointerException
06-23 13:11:27.181: E/AndroidRuntime(523):  at android.content.ContextWrapper.getPackageName(ContextWrapper.java:120)
06-23 13:11:27.181: E/AndroidRuntime(523):  at android.preference.PreferenceManager.getDefaultSharedPreferencesName(PreferenceManager.java:353)
06-23 13:11:27.181: E/AndroidRuntime(523):  at android.preference.PreferenceManager.getDefaultSharedPreferences(PreferenceManager.java:348)
06-23 13:11:27.181: E/AndroidRuntime(523):  at by.permby.koteby.api.example.Account.save(Account.java:13)
06-23 13:11:27.181: E/AndroidRuntime(523):  at by.example.me.ProActivity.logOutVK(ProfileUserActivity.java:483)
06-23 13:11:27.181: E/AndroidRuntime(523):  at by.example.me.ProActivity.showPrint(ProfileUserActivity.java:505)
06-23 13:11:27.181: E/AndroidRuntime(523):  at by.example.me.deout.MenuFragment$2.onClick(MenuFragment.java:125)
06-23 13:11:27.181: E/AndroidRuntime(523):  at android.view.View.performClick(View.java:2408)
06-23 13:11:27.181: E/AndroidRuntime(523):  at android.view.View$PerformClick.run(View.java:8816)
06-23 13:11:27.181: E/AndroidRuntime(523):  at android.os.Handler.handleCallback(Handler.java:587)
06-23 13:11:27.181: E/AndroidRuntime(523):  at android.os.Handler.dispatchMessage(Handler.java:92)
06-23 13:11:27.181: E/AndroidRuntime(523):  at android.os.Looper.loop(Looper.java:123)
06-23 13:11:27.181: E/AndroidRuntime(523):  at android.app.ActivityThread.main(ActivityThread.java:4627)
06-23 13:11:27.181: E/AndroidRuntime(523):  at java.lang.reflect.Method.invokeNative(Native Method)
06-23 13:11:27.181: E/AndroidRuntime(523):  at java.lang.reflect.Method.invoke(Method.java:521)
06-23 13:11:27.181: E/AndroidRuntime(523):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-23 13:11:27.181: E/AndroidRuntime(523):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-23 13:11:27.181: E/AndroidRuntime(523):  at dalvik.system.NativeStart.main(Native Method)