Why wont my PS2 spiderman game go on to the next chapter?

ive finished all of level 9, and it wont move on to the next chapter please help me im so fricking annoyed by it thanks|||Scratched disk or just a glitch probably. Give the disk a wipe and restart from your save point - should be fine.|||Delete your spiderman data then start again and youll be on level 10|||(facepalm) buy a ps3 or xbox360