MediaPlayer.Pause not working?

1

When I try to use it, it gives me this error.

HRESULT: [0x80004003], Module: [General], ApiCode: [E_POINTER/Invalid pointer], Message: Invalid pointer

The code is pretty simple:

                if (bMusic != optionsMenu.bMusic)
                {
                    if (optionsMenu.bMusic == true)
                    {
                        MediaPlayer.Resume();
                    }
                    else
                    {
                        MediaPlayer.Pause();
                    }
                    bMusic = optionsMenu.bMusic;
                }