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[SOLVED] Crash on project startup

Hey everyone.
Yesterday I worked some on my project and today it won’t start at all. This is very worrying and I can’t figure out what has gone wrong.
I haven’t made a backup in quite some time, which of course is dumb of me, but I was really only polishing at this point. I’m guessing a blueprint is causing this, but how do I find out which one?

Any help is appreciated

Alright, panicking all morning I solved it by copying file by file from an old version until it stopped being an issue.
One of the widgets had randomly become corrupt, the only difference on it was that I added a text field.