When I try to see if there is something in the folder it comes up with:

ls: cannot access /home/pi/RetroPie/emulators/gpsp: No such file or directory

When I try to run the emulator from command line:

-bash: /home/pi/RetroPie/emulators/gpsp/raspberrypi/gpsp: No such file or directory

Thanks for the reply though

EDIT: the gpsp emulator had been deleted, so I copied it back across. Now, it says permission denied instead of no such file or directory when I try to run from command line, but when I try to see if there is anything in it it says

total 4
drwxr-xp-x 3 pi_pi 4096 Apr 25 11:55 raspberrypi