You are trying to replace or create a Prefab from instance 'GameObject' that references a missing Script. This is not allowed. Please change the Script orremove it from the GameObject.

when i tried uploading an avatar that i downloaded from VRCMods.com , Unity gave me this error message : You are trying to replace or create a Prefab from instance 'GameObject' that references a missing Script. This is not allowed. Please change the Script orremove it from the GameObject. I dont know what to do so if anyone had this problem before and managed to fix it how did you do it ? Is there even a Video that shows you how to fix this exact same problem ?,when i tried online uploading an avatar that i downloaded from VRCMods.com i couldnt cause it said this : You are trying to replace or create a Prefab from instance 'GameObject' that references a missing Script. This is not allowed. Please change the Script orremove it from the GameObject. I dont know what to do about that so if anyone knows what to do or even knows a video what shows exsacly what to do I'd be great