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java.io.IOException: MAIN_THREAD	at com.google.firebase.iid.zzd.zzb(Unknown Source)	at com.google.firebase.iid.FirebaseInstanceId.deleteInstanceId(Unknown Source)	at jp.seesaa.itmama.push.PushUtil.setPushSetting(PushUtil.java:32)	at jp.seesaa.itmama.ui.main.setting.SettingFragment.onSharedPreferenceChanged(SettingFragment.java:66)	at android.app.SharedPreferencesImpl$EditorImpl.notifyListeners(SharedPreferencesImpl.java:476)	at android.app.SharedPreferencesImpl$EditorImpl.apply(SharedPreferencesImpl.java:384)	at android.support.v4.content.EditorCompatGingerbread.apply(EditorCompatGingerbread.java:25)	at android.support.v4.content.SharedPreferencesCompat$EditorCompat$EditorHelperApi9Impl.apply(SharedPreferencesCompat.java:45)	at android.support.v4.content.SharedPreferencesCompat$EditorCompat.apply(SharedPreferencesCompat.java:67)	at android.support.v7.preference.Preference.tryCommit(Preference.java:1353)	at android.support.v7.preference.Preference.persistBoolean(Preference.java:1558)	at android.support.v7.preference.TwoStatePreference.setChecked(TwoStatePreference.java:79)	at android.support.v7.preference.TwoStatePreference.onClick(TwoStatePreference.java:64)	at android.support.v7.preference.Preference.performClick(Preference.java:971)	at android.support.v7.preference.Preference.performClick(Preference.java:957)	at android.support.v7.preference.SwitchPreferenceCompat.performClick(SwitchPreferenceCompat.java:203)	at android.support.v7.preference.Preference$1.onClick(Preference.java:145)	at android.view.View.performClick(View.java:4780)	at android.view.View$PerformClick.run(View.java:19866)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5254)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)