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Blueprint Invalid on startup

I have a problem with a blueprint that thinks it’s invalid ( One or more blueprints has an unresolved compiler error, are you sure you want to Play in Editor?
BP_Weapon" ) when I start ue4, as soon as I click “compile” however it realizes that it’s not invalid and says it’s good, obviously I’ve saved edited and saved the blueprint but it still does this weird problem.

I think this might have to do with me duplicating the blueprint, then editing the original blueprint and stuffing it up, so deleting the original then renaming the duplicate in the file explorer to the original file. So somewhere something isn’t right.

Somebody told me to use “fix up re-directions in folder” but that didn’t work.

Remove all references to the blueprint in your levels. You may also have some luck duplicating it again and then deleting the original inside the editor.