Question on opening my map

I am almost certain this is in the wrong place but I kinda dont know my way around this place (i get lost alot when i'm new to things)

Well, ive been working on my map for very long and its my first map and im proud of it because almost all people love it. The problem is, one day (today) i can't open it, and i've tried restarting comp. I get this error:

Object: CustomObjectField (.?AUCustomObjectField@@)

Please help!

Nvm, fixed the problem