Exception when trying to add a new dictionary entry on my cell phone

exception.txt

Process: com.android.settings, PID: 23842
                                                   java.lang.ClassCastException: com.android.settings.SubSettings cannot be cast to com.android.settings.SettingsActivity
                                                       at com.android.settings.UserDictionarySettings.showAddOrEditDialog(UserDictionarySettings.java:195)
                                                       at com.android.settings.UserDictionarySettings.onOptionsItemSelected(UserDictionarySettings.java:176)
                                                       at android.app.Fragment.performOptionsItemSelected(Fragment.java:2250)
                                                       at android.app.FragmentManagerImpl.dispatchOptionsItemSelected(FragmentManager.java:2003)
                                                       at android.app.Activity.onMenuItemSelected(Activity.java:3027)
                                                       at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:1208)
                                                       at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:761)
                                                       at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:155)
                                                       at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:904)
                                                       at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:894)
                                                       at android.widget.ActionMenuView.invokeItem(ActionMenuView.java:611)
                                                       at com.android.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:180)
                                                       at android.view.View.performClick(View.java:5197)
                                                       at android.view.View$PerformClick.run(View.java:20926)
                                                       at android.os.Handler.handleCallback(Handler.java:739)
                                                       at android.os.Handler.dispatchMessage(Handler.java:95)
                                                       at android.os.Looper.loop(Looper.java:145)
                                                       at android.app.ActivityThread.main(ActivityThread.java:5951)
                                                       at java.lang.reflect.Method.invoke(Native Method)
                                                       at java.lang.reflect.Method.invoke(Method.java:372)
                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1388)
                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1183)