Project wont open

General Issues and Bug Reporting (Unreal Engine)
1

Summary

Hi, i’ve been working without problem on a project for the last month. Tryed to open it today. Uefn closes with error message (see under). Other projects open without troubles. Tryed to remove the files and get them from online save, same problem.

What Type of Bug are you experiencing?

Other

Steps to Reproduce

Saved localy and online the project with verse compiled and without problem.
Shut down computer.
Restart
Launch Uefn
Open project

Expected Result

Open the project

Observed Result

Uefn closes and bug report

Affects Versions

5.4

Platform(s)

Windows

For crash reports, include your callstack

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000000000000a0

UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
UnrealEditorFortnite_Engine_Win64_Shipping
kernel32
ntdll

Solution found:

2

I explored quite all the options, seems probable that a file is corrupted in that project, anyone got a way to find the corrupt file? otherwise, copy/paste files 1 by 1 on an empty project.

3

.umap file was corrupted
In case it happens to you, here’s how to fix it:
WARNING: you have to have revision ON before the pb happens
remove .umap from content (+make a full copy of the the project just in case)
open the project, should work fine
open revision and select the version before the latest, sync
if uefn stays open, means you’re on the right way
go get the .umap from that version in the file and copy/paste it elsewhere
go back to your project on uefn, load the last revision, uefn crashes, no worries
copy/paste the .umap you just collected to replace the one in the project file folder Content
except for the map modifications you made between the 2revision versions all the rest should be fine.
Have a nice day