Pokemon game editor - gba won't open

So, as title say's. After hacking fire red, and adding some pokemons, my game just won't start. After opening emulator, and choosing my hacked fire red rom, the game will only display white screen, and nothing else. Any help?

Exactly what and how did you do?
Those things screw up with little errors so check your editions/additions to the game to see if you made a mistake.
Also, try another emulator; maybe the one you use isn't working.