It may be a No$Zoomer error.Because the no$zoomer frontend is not really stable.The code is messed up.I'll suggest you that you try DeSmuMe.
you can import your save game from no$zoomer.
For desmume you will need:
An SSE2 capable processor with at least 2,5 GHZ
1 GB of RAM
A Newer Nvidia or Ati Graphics with 128 MB of VRAM
Sound Card
Microphone (Optional)
Keyboard,mouse
Joystick (optional)
you can get desmume from this link
http://www.desmume.com/download.htm