Rom Stopped working!

[jpok1000]

Hi all! I've just recently downloaded Project64 as I love some of the all time classic games on it. For the past three days now I have been playing on the rom Mario world & it's been loading & working fine. However all of a sudden when I try to load the rom I'm presented with a small error window saying "file loaded does not appear to be a valid Nintendo 64 rom" Only I have loaded the rom many times now. Can somebody please help me out on this one

 

[Agozer]

...

Super Mario World isn't a Nintendo 64. It's a Super Nintendo title. Super Mario 64 however, is a Nintendo 64 title.

Repeat after me: Project64 is not a Super Nintendo emulator.