A Blueprint Cannot Recongnize ParentClass , Cannot ReParent To Any Subclass Of Actor After Complied

Development Programming & Scripting Blueprint
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I Just Complied A BlueprintLibraryClass, And This Critical Issue Occorred.

Editor Log Shows Following Warnings:

LogContentBrowserAssetDataSource: Warning: Unable to convert short ParentClass name "None" to path name
LogBlueprint: Warning: Blueprint /Game/TopDown/Blueprints/BP_TopDownCharacter is missing GeneratedClass asset tag

This Blueprint BP_TopDownCharacter Should Be A Subclass Of ATeamCharacter, a subclass of CharacterACharacter

However, It turned into None, I cannot ReParent it into TeamCharacter, Character, even Actor.
I’ve Rebuild all code, delete Intermediate/Binaries/Saved/DerivedDataCache folder. Now I can Create New Blueprint From ATeamCharacter, but I just Can’t Reparent to Fix The Original One Blueprint.
Now I Can Only ReParent it into some special UObjects, like ActorComponent, Widget

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