Level Blueprint Causes Crash

Ok hi Im .
So im working on a HorrorHospital for my GameEngine Scripting class, and I was putting in the final touches and i…kinda broke it. By renaming MatineeActor5 (referenced in blueprint). So yeah, obviously shoud have deleted the reference first, but is there anyway to recover a previous version of the level? It still allows me to play the level, but half the stuff doesn’t work now, and everytime i try to open the level blueprint, it crashes unreal.
Suggestions?

Thanks,