I just opened uefn almost a week ago and it started giving me this error constantly while loading the map. Loading gets to 79% and while downloading skinned assets it crashes.
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000038
I am having the exact same issue. For me uninstalling Fortnite and Reinstalling (Fortnite and UEFN) will allow me to work on the project for a day and then this error message pops back up and prevents me from opening a project.
I need an anser or a fix for why this is happening. So annoying.