2 black screens when I try to load pokemon diamon

I'm using the no$gba emulator and I started playing Pokemon for an hour or so then used the in game saved, it said save successful, so I exited the emulator. I came back later, loaded it up, and press continue and press on my file that I saved earlier. When I do all that comes up is two black screens, so I cant really play the game. Do i need something else installed or what wrong?
TY

K thanks