Corruption not shown

My file says there's a corruption and it won't save, but I've played through the whole thing and there's nothing wrong. I want to salvage this piece since I have 1 1/2 movements of a concerto finished and it's taken me hours, but I can't fix this. Any ideas?

Also, all of the errors are on measures that don't exist. It says measure 300 error, but there's not 300 measures?? I'm hoping to fix this