loading file crash

I have this problem I was working on the level after finishing work I saved the file and when I tried to run it again I saw this message and until now I can’t open the file and I have no idea what happened

Without debugging symbols installed the error message is pretty vague.

Access violation with all zeros would probably indicate a null pointer exception. (your application was trying to access a variable / object that doesn’t exist in memory or is uninitialized)