Well, It’s a big mess of words and letters, but I often see this recurring: Error: " UE4Editor-Core.dll! "
Sounds like something is wrong with the engine itself. Check if your engine is up to date. Otherwise I would say try to change between this version and an older one. You could also try to re-install. Or just contact tech support.
I would sure as heck make good backups of your projects before doing anything I suggested to avoid your work being lost in the process.
I am no tech genius and I never had this problem, but I hope it helps you.