Packaged Project won't open Mac

Hello! I’ve recently been working on a game and wanted to package it and I am able to package it but whenever I try to open the application it pops up with, The application cannot be opened. At first, I had a problem where one of the blueprints in my level wasn’t compiling correctly so I deleted it since it wasn’t something that I would be needing and recompiled it, which made the game package successfully. However, my mac won’t let me open the project for some reason. I need this to be resolved ASAP because it’s due for an assignment and any help would be appreciated!