Sorry, but that's actually NOT really a reporting Scratch alert. but yes, some neutral alert. Cuz it does actually really say that your own Scratch project was actually some exact copy of the original one. So.. I guess you sincerely just forgot to credit someone for the original or you just did copy it unintentionally.. -_-
Credits: @Alexandplay (For the original project.) Also, C2A (Credit To All). ;)