Greetings @Zackottina
Welcome to the Unreal Engine Community Forums. This error occurs when you’re trying to access/grab something from an address that doesn’t belong to the array. If you’ve recently moved your projects location on your drive, changed file names, or anything of that sort, that’s where I’d start. Here’s a post explaining more about the specific error: Assertion failed (Index >= 0) & (Index < ArrayNum). I hope that helps!