Hi!
Hmm, these are the forums for the Unreal Engine (development), specifically, so I don’t know if you’re going to get Fortnite answers here. However, I can see it has something to do with an exception error… Try running the Fortnite .exe as administrator? (Right click, run as admin).
Ultimately you’ll want to post on the Fortnite forums specifically, unless you already have. =)