On my first week of learning Unreal and its been fairly smooth up until this point. Today I’ve been playing around with paragon characters and learning about animation. I imported a Mixamo animation and retargeted the skeleton to the paragon skeleton. A few things were rotated improperly so I rotated them back, added a key frame, hit apply, EZY PEASY! I decided to get wild and import a 2nd animation and followed step by step by step of everything I did for the first animation! My weapon came in rotated 90 degrees in the wrong direction so I rotated it, added a key frame, hit apply. But now it causes unreal to crash. It works on every single bone expect for the single one I want to rotate, naturally 
plz help before I lose my mind
LoginId:c3c265b64ec19ed8657ad4b4b1517451
EpicAccountId:30fec28773b148f1ad33e090808f6172
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION writing address 0x00000660
UE4Editor_RenderCore
UE4Editor_RenderCore
UE4Editor_Core
UE4Editor_Core
UE4Editor_RenderCore
UE4Editor_RenderCore
UE4Editor_Core
UE4Editor_Core
kernel32
ntdll