Scripts

GiveExp() seems to be written incorrectly:
GiveExpToLevel() - and this function gives the amount of experience needed for the next level
P.S. It would be good to mention what the console displays.

The console does indeed complain about GiveExp, as well as Get difficulty and Difficulty Easy, Difficulty Normal, etc.

Added 1 minute ago
GiveExp was taken from the manual. It worked when there were no other scripts.