Unreal Egnine 5 crashing on startup at 98%

Hi there I need some help with this error:

Assertion failed: CurveNames.Num() == CurveValues.Num() [File:D:\build++UE5\Sync\Engine\Source\Runtime\AnimGraphRuntime\Private\AnimNodes\AnimNode_ModifyCurve.cpp] [Line: 87]

UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
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UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_AnimGraphRuntime
UnrealEditor_AnimGraphRuntime
UnrealEditor_Engine
UnrealEditor_Engine
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UnrealEditor_UnrealEd
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UnrealEditor
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UnrealEditor
kernel32
ntdll

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It’s a ue4 project being upgraded to ue5 and it seems there’s an issue with the animgraphs. I’ve cleaned the old project for the most part but this one error still occurs. Does anyone know how to resolve this please?

Things I’ve tried: deleting intermediate folder from project directory. deleting “CachedAssetRegistry.bin” from “AppData\Local\UnrealEngine\5.0\Intermediate”

Not sure what’s happening :frowning: