NullPointerException

[lingling-fan]

//package name: org.droidupnp
//version: 2.3.0
java.lang.NullPointerException
at android.preference.PreferenceManager.getDefaultSharedPreferencesName(PreferenceManager.java:374)
at android.preference.PreferenceManager.getDefaultSharedPreferences(PreferenceManager.java:369)
at org.droidupnp.view.SettingsActivity.getSettingContentDirectoryName(SettingsActivity.java:99)
at org.droidupnp.view.SettingsActivity$ContentDirectorySettingsFragment.onSharedPreferenceChanged(SettingsActivity.java:236)
at android.app.SharedPreferencesImpl$EditorImpl.notifyListeners(SharedPreferencesImpl.java:475)
at android.app.SharedPreferencesImpl$EditorImpl.apply(SharedPreferencesImpl.java:385)
at android.preference.Preference.tryCommit(Preference.java:1350)
at android.preference.Preference.persistString(Preference.java:1383)
at android.preference.EditTextPreference.setText(EditTextPreference.java:88)
at android.preference.EditTextPreference.onDialogClosed(EditTextPreference.java:142)
at android.preference.DialogPreference.onDismiss(DialogPreference.java:383)
at android.app.Dialog$ListenersHandler.handleMessage(Dialog.java:1232)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)