UE4 project crashes when splash screen hits 100%

[redendermansk1]

Summary

I’ve been working on my game for a few days but today it froze along with other apps so I turned off and on my pc. Now it can’t load and is showing this error. Assertion failed: !bOnlyOneRootAllowed || (((BoneIndex == 0) && (BoneInfo.ParentIndex == INDEX_NONE)) || ((BoneIndex > 0) && RawRefBoneInfo.IsValidIndex(BoneInfo.ParentIndex) && (BoneInfo.ParentIndex < BoneIndex))) [File:D:\Build++UE4\Sync\Engine\Source\Runtime\Engine\Public\ReferenceSkeleton.h] [Line: 203]

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Other

Steps to Reproduce

1. Make project freeze
2. turn off and on your pc

Expected Result

I didn’t have this problem on my other projects

Observed Result

Now the project doesn’t even open

Platform(s)

Windows 10, Unreal engine 4.27.2

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