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Attempt to invoke virtual method 'android.support.v7.widget.RecyclerView$LayoutManager android.support.v7.widget.RecyclerView.getLayoutManager()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v7.widget.RecyclerView$LayoutManager android.support.v7.widget.RecyclerView.getLayoutManager()' on a null object reference	at com.example.wsdw.MainActivity.onOptionsItemSelected(MainActivity.java:50)	at android.app.Activity.onMenuItemSelected(Activity.java:2908)	at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:406)	at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:195)	at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:103)	at android.support.v7.app.AppCompatDelegateImplV9.onMenuItemSelected(AppCompatDelegateImplV9.java:667)	at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:810)	at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152)	at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:957)	at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:947)	at android.support.v7.widget.ActionMenuView.invokeItem(ActionMenuView.java:616)	at android.support.v7.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:153)	at android.view.View.performClick(View.java:5198)	at android.view.View$PerformClick.run(View.java:21147)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:148)	at android.app.ActivityThread.main(ActivityThread.java:5417)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)