It's 99% of chance of being the scripts.
But well, if you don't give more info, how do you expect people to help you?
People can't guess what happening if you don't be more clear.
First of all, remove all the custom scripts and save the game, then load.
No errors?
Delete the save, add *ONE* of thes script then save > load again.
Repeat it until you get the error.
Also posting screens of the message error would help a lot.