java.lang.NullPointerException

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  • java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference at scala.collection.convert.Wrappers$JListWrapper.iterator(Wrappers.scala:88) at scala.collection.IterableLike$class.foreach(IterableLike.scala:72) at scala.collection.AbstractIterable.foreach(Iterable.scala:54) at scala.collection.TraversableOnce$class.addString(TraversableOnce.scala:357) at scala.collection.AbstractTraversable.addString(Traversable.scala:104) at scala.collection.TraversableOnce$class.mkString(TraversableOnce.scala:323) at scala.collection.AbstractTraversable.mkString(Traversable.scala:104) at scala.collection.TraversableOnce$class.mkString(TraversableOnce.scala:325) at scala.collection.AbstractTraversable.mkString(Traversable.scala:104) at com.github.shadowsocks.utils.TcpFastOpen$.enabled(TcpFastOpen.scala:49) at com.github.shadowsocks.ShadowsocksSettings.com$github$shadowsocks$ShadowsocksSettings$$onPreferenceChange$body$16(ShadowsocksSettings.scala:162) at com.github.shadowsocks.ShadowsocksSettings$$anonfun$17.onPreferenceChange(ShadowsocksSettings.scala:160) at android.preference.Preference.callChangeListener(Preference.java:939) at android.preference.TwoStatePreference.onClick(TwoStatePreference.java:65) at android.preference.Preference.performClick(Preference.java:994) at android.preference.PreferenceScreen.onItemClick(PreferenceScreen.java:214) at android.widget.AdapterView.performItemClick(AdapterView.java:310) at android.widget.AbsListView.performItemClick(AbsListView.java:1155) at android.widget.AbsListView$PerformClick.run(AbsListView.java:3126) at android.widget.AbsListView$3.run(AbsListView.java:4041) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

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