Error when running packaged game

The game packages just fine but when I run the exe I get this error on start

load package async failed to begin to load a package because the supplied package name was neither a valid long package name nor a filename of a map within a content folder: “”

I thought it might be an issue with the asset manager and deleted everything but the map and primary asset tag stuff that it starts with, but still getting the error. My project used to be able to package and run but that was like a month ago and a lot has changed since then (including updating to 4.20.3). Anyone know what the issue could be?