ClassCastException while sharing db

[reisub]

W/System.err: java.lang.ClassCastException: im.dino.dbinspector.activities.DbInspectorActivity cannot be cast to im.dino.dbinspector.fragments.PreferenceListFragment$OnPreferenceAttachedListener
W/System.err:     at im.dino.dbinspector.fragments.PreferenceListFragment.onCreate(PreferenceListFragment.java:135)
W/System.err:     at android.support.v4.app.Fragment.performCreate(Fragment.java:2075)
W/System.err:     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1060)
W/System.err:     at android.support.v4.app.BackStackRecord.setLastIn(BackStackRecord.java:838)
W/System.err:     at android.support.v4.app.BackStackRecord.calculateFragments(BackStackRecord.java:878)
W/System.err:     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:719)
W/System.err:     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1682)
W/System.err:     at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:594)
W/System.err:     at im.dino.dbinspector.fragments.TableFragment.onOptionsItemSelected(TableFragment.java:209)
W/System.err:     at android.support.v4.app.Fragment.performOptionsItemSelected(Fragment.java:2212)
W/System.err:     at android.support.v4.app.FragmentManagerImpl.dispatchOptionsItemSelected(FragmentManager.java:2295)
W/System.err:     at android.support.v4.app.FragmentController.dispatchOptionsItemSelected(FragmentController.java:353)
W/System.err:     at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:414)
W/System.err:     at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:198)
W/System.err:     at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:107)
W/System.err:     at android.support.v7.app.AppCompatDelegateImplV9.onMenuItemSelected(AppCompatDelegateImplV9.java:671)
W/System.err:     at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:817)
W/System.err:     at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:156)
W/System.err:     at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:964)
W/System.err:     at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:954)
W/System.err:     at android.support.v7.widget.ActionMenuView.invokeItem(ActionMenuView.java:624)
W/System.err:     at android.support.v7.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:157)
W/System.err:     at android.view.View.performClick(View.java:5637)
W/System.err:     at android.view.View$PerformClick.run(View.java:22429)
W/System.err:     at android.os.Handler.handleCallback(Handler.java:751)
W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:95)
W/System.err:     at android.os.Looper.loop(Looper.java:154)
W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:6119)
W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)