Warning: Failed to find the world in already loaded world package

Development Platform & Builds
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1

I was working on my senior project when my computer crashed. When i went to reopen my project the scene i was working in is no longer in the content browser. I can see the .umap in my folder but the project cant find it! Please let me know if anyone has gone through this before!

output log:

LoadErrors: New page: Loading map: Arcadia_v03.umap
LogWorld: UWorld::CleanupWorld for Untitled, bSessionEnded=true, bCleanupResources=true
LogSlate: InvalidateAllWidgets triggered.  All widgets were invalidated
MapCheck: New page: Map Check
LightingResults: New page: Lighting Build
LogAudio: Display: Audio Device unregistered from world 'None'.
LogUObjectHash: Compacting FUObjectHashTables data took   1.09ms
LogSlate: Window 'Message' being destroyed
Message dialog closed, result: Ok, title: Message, text: Failed to find the world in already loaded world package /Game/Arcadia_v03! See log for more details.
LogReferenceChain: Package /Game/Arcadia_v03 is not currently reachable.
LogEditorServer: Warning: Failed to find the world in already loaded world package /Game/Arcadia_v03! Referenced by:

Package /Game/Arcadia_v03 is not currently reachable.

2

Same issue here, but I’m using UE5 Early Access. “Failed to find the world in already loaded world package /Game/Maps/KarczmaPodgrodzie! See log for more details.” I can see the .umap in the file explorer, but not in the content browser. Still can’t find the solution

3

Same thing for me on UE5 EA, did you find any solution?

4

Please! same here! im losing lots of work!! help!

5

Hello all,
Same here, with 4.27
Can’t open the map I was workin on, anyone find a solution please?

6

Did yall find a solution?

7

Captura de Pantalla 2022-07-27 a las 16.22.48
Captura de Pantalla 2022-07-27 a las 16.22.481108Ă—272 18.7 KB

Captura de Pantalla 2022-07-27 a las 16.24.15
Captura de Pantalla 2022-07-27 a las 16.24.15300Ă—516 44.7 KB

/Game = /Content
Go to that folder and delete the hidden Main.umap file.

2 Likes
8

Shut down Unreal and, using Windows Explorer, move the problematic umap file to another folder.
Afterwards, copy a backup of the umap file into the same project folder.
Fire up Unreal again. You should see the old umap file in Unreal’s Browser too.

Shut Unreal down again and copy the problematic umap file back to where it was, overwriting the backup one.
Launch Unreal and the right umap file should be generated in Unreal’s Browser.

9

Didn’t work for me

10

I just had this happen to me and nothing is working. Has anyone found a solution? Im doing a solo project and have 400+ hours and over 6 months worth put into this. Also, i dont need the beating about making back ups please. im kicking myself big time on this already.

11

This same thing has happened to me yesterday, I didn’t put as many hours into it but my project I was working on is due today for a uni module. It’s very frustrating, and I can’t find the answer, this thread is over 3 years old but no one seems to have any answers about how to really solve this problem. I don’t suppose you have had any luck yet?

1 Like
12

I got the same problem. lost all the progress of my work.
then I found the solution but I still lost 3 days progress.

solution = copy Main.umap to another folder outside the content folder.

tips : go to → Saved\Autosaves\Game → copy the Main_auto1.Umap into the content and rename it to Main.Umap.

its working but still lost some days progress.

4 Likes
14

I’ve just had the exact same problem. So much time and work lost because of a stupid crash. I can’t believe UE5 can corrupt an entire Level like this and reading so many comment, it seems like there is no solution.

I need to learn version control because UE5 is so unstable (and I have a high end PC - 13900k 128gb DDR5 6200 Ram, 3090FE, 12tb NVME etc etc) that I can’t lose this much time and work.

15

thank you very much!!!

16

BROO!!! Thank you so much!!! you are a life saver

17

Thank you! That worked like a charm and is certainly handy to know. My PC very randomly crashed and shut down during a build which corrupted the umap file. So for anyone else struggling:

The Solution:

  1. Backup: First, move your current (corrupted) .umap to a safe folder outside of your Content folder and copy its name exactly.

  2. Locate Autosave: Navigate to Saved\Autosaves\Game.

  3. Select File: Find your most recent autosave (e.g., YourMap_auto1.umap).

  4. Restore: Copy that file into your Content folder.

  5. Rename: Rename the autosave to match your original map name you copied exactly (e.g., rename Main_auto1.umap to Main.umap)."

  6. Build.
    If you have been saving regularly, then there should not be any loss of progress at all. If you have lost progress then you either did not select the most recent save or the map did not save for some reason. Either way - ensure to always have a backup and that the auto-save runs every few minutes. Good luck! :slight_smile: