Crash on startup [4.14]

Project began to crash on startup completely out of nowhere.
Heres the crash log link text

Hey -

Are you using code in the project? If so, was there any code changes made prior to the crashing starting? Looking at the logs, it seems there is an unknown struct (Game/MyUI/Spellbook/SpellSlot.SpellSlot_C:SpellInfo) . If this is setup in code, please provide the code used. If this is inside a struct blueprint, please try moving the .uasset for the struct out of the content folder and then try to open the project again.

I fixed it by updating to 4.15. No , there isn’t any code in the project. For now, everything could be done with blueprints easily. Also this struct has not been touched for a while. The things it used aswell. It was a old spellbook that i was to lazy to finish.