[CRITICAL] Failed to cook, character is being killed in the uefn lobby

General Issues and Bug Reporting
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1

Summary

PlatformCook: Error: We hit an error while cooking this content
PlatformCook: Error: errors.com.epicgames.content-service.cook_failure
PlatformCook: Error: CookJobId:103d7fb0-f9d9-4758-a70b-826afd768d2d
PlatformCook: Error: An error occurred while communicating with the game servers (failed to cook module eff3d2b7-4188-0a07-bda7-4c983d8d4949 (artifact 8912dbdb-8b90-49e8-86c9-0eecfeab3a98:pc) (cookJobId 103d7fb0-f9d9-4758-a70b-826afd768d2d) with error code errors.com.epicgames.cookplugin.cookfailure).
LogValkyrieEditorAnalytics: Displaying Stats for Flow
LogValkyrieEditorAnalytics: =========================
LogValkyrieEditorAnalytics: Flow=Play
LogValkyrieEditorAnalytics: PlayFlow=421.609
LogValkyrieEditorAnalytics: ↳ PrepareProjectSourceData=159.148
LogValkyrieEditorAnalytics: ↳ ProjectUpload=114.932
LogValkyrieEditorAnalytics: ↳ SyncWithContentService=2.341
LogValkyrieEditorAnalytics: ↳ UpdateProjectMetadata=1.000
LogValkyrieEditorAnalytics: ↳ InitSyncModules=4.478
LogValkyrieEditorAnalytics: ↳ StageProjectModules=30.757
LogValkyrieEditorAnalytics: ↳ GatherFilesForValidation=0.026
LogValkyrieEditorAnalytics: ↳ DownloadPublishedVerseFiles=5.022
LogValkyrieEditorAnalytics: ↳ ValidateProject=71.176
LogValkyrieEditorAnalytics: ↳ FindServer=14.422
LogValkyrieEditorAnalytics: ↳ MatchmakingToServer=10.901
LogValkyrieEditorAnalytics: ↳ UploadCookDownload=248.039
LogValkyrieEditorAnalytics: ↳ ProjectUpload=137.321
LogValkyrieEditorAnalytics: ↳ SyncWithContentService=1.844
LogValkyrieEditorAnalytics: ↳ UpdateProjectMetadata=0.759
LogValkyrieEditorAnalytics: ↳ InitSyncModules=1.671
LogValkyrieEditorAnalytics: ↳ StageProjectModules=2.853
LogValkyrieEditorAnalytics: ↳ PruneScratchSpaceFiles=6.127
LogValkyrieEditorAnalytics: ↳ UploadFiles=94.279
LogValkyrieEditorAnalytics: ↳ CreateModuleVersions=29.665
LogValkyrieEditorAnalytics: ↳ StoreSnapshot=0.761
LogValkyrieEditorAnalytics: ↳ ServerClientCookUnloadLoad=110.721
LogValkyrieEditorAnalytics: =================================
LogValkyrieActivityTracker: Warning: Session → Fail Activity: LoadingNewContent - Error updating content

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Assets

Steps to Reproduce

Open a 33.30 project
Rebuild landscape (yellow triangle)
Launch session
Save all updated assets

Expected Result

Can start game

Observed Result

There is no lego minifigure in the lobby
Fortnite character is killed in the uefn lobby (where there are hexagons and trees)

Platform(s)

Windows

2

hi @latundaPC ,
Please read another post which is being worked on and a similar problem
[MAJOR] Cook Failure Out Of Memory - General / Issues and Bug Reporting - Epic Developer Community Forums

3

FORT-924671 has been created and its status is ‘Unconfirmed’. This is now in a queue to be reproduced and confirmed.

4

I think I did not have the “outofmemory” part in the error message.

5

Hi Probably have to wait until Epic have finished.
There are six entries about cook failure this month, but over 20 over the last six months, currently some errors occur on PC but not on console Launches.
This problem is far deeper then we indie dev can understand and replicate

6

I have exactly the same error as you, but I don’t understand where it comes from, when I launch a session my player dies and I get this error message :

PlatformCook: Error: We made a mistake in preparing this content.
PlatformCook: Error: errors.com.epicgames.content-service.cook_failure
PlatformCook: Error: CookJobId :64aac3cb-9454-4049-b8a1-05dd7de790e6
PlatformCook: Error: An error occurred while communicating with the game servers (failed to cook module 7a8a1659-491a-1cee-9e51-499853d3782a (artifact 9581f60f-4a54-4b0c-92b6-e96af1affd14:pc) (cookJobId 64aac3cb-9454-4049-b8a1-05dd7de790e6) with error

I’m stuck and I wanted to post my map on Friday … if you find the solution I would love to know,

Thanks,

7

hi,
Do your islands use streaming? In another post, there was cook problem .
The post basically is something to do with HLOD streaming works

Cook fails on Push, but works with Launch - General / Issues and Bug Reporting - Epic Developer Community Forums

8

This particular project never cooks (after 36.0 while other projects work ok regardless of streaming settings). I wonder what it says in the server error.

I disabled streaming and deleted data layers:
LogEOSSDK: Warning: LogHttp: 00000209758D1200: request has been successfully processed. URL: https://api.epicgames.dev/datarouter/api/v1/public/data/clients?AppID=3fd15bc288014f698cca1a3d1f01c7af&AppVersion=1.17.3600.0-43058264&AppEnvironment=fn&UploadType=eteventstream&SessionID=F4D11CAC4600DEE390C3C48BBC8B4533, HTTP code: 503, content length: 81, actual payload size: 81, elapsed: 0.20s
LogEOSSDK: Warning: LogHttp: 00000209758D1200 Response Header Date: Tue, 17 Jun 2025 19:15:07 GMT
LogEOSSDK: Warning: LogHttp: 00000209758D1200 Response Header Content-Type: text/plain
LogEOSSDK: Warning: LogHttp: 00000209758D1200 Response Header Content-Length: 81
LogEOSSDK: Warning: LogHttp: 00000209758D1200 Response Header Connection: keep-alive
LogEOSSDK: Warning: LogHttp: 00000209758D1200 Response Header X-Epic-Correlation-Id: EOS-1YPw3tLl2E6XzcdQSqOteQ-HlcOfpD7jUS276aFum9tKA
LogEOSSDK: Warning: LogHttp: 00000209758D1200 Response Header Server: eos-gateway
LogEOSSDK: Warning: LogHttp: Lockout of 2.463942s on https://api.epicgames.dev/datarouter/api/v1/public/data/clients?AppID=3fd15bc288014f698cca1a3d1f01c7af&AppVersion=1.17.3600.0-43058264&AppEnvironment=fn&UploadType=eteventstream&SessionID=F4D11CAC4600DEE390C3C48BBC8B4533
LogEOSSDK: Warning: LogHttp: Retry 1 on https://api.epicgames.dev/datarouter/api/v1/public/data/clients?AppID=3fd15bc288014f698cca1a3d1f01c7af&AppVersion=1.17.3600.0-43058264&AppEnvironment=fn&UploadType=eteventstream&SessionID=F4D11CAC4600DEE390C3C48BBC8B4533
LogEOSSDK: Warning: LogHttp: Success on https://api.epicgames.dev/datarouter/api/v1/public/data/clients?AppID=3fd15bc288014f698cca1a3d1f01c7af&AppVersion=1.17.3600.0-43058264&AppEnvironment=fn&UploadType=eteventstream&SessionID=F4D11CAC4600DEE390C3C48BBC8B4533
LogEOSSDK: Warning: LogHttp: 00000209758DAE00: request has been successfully processed. URL: https://api.epicgames.dev/datarouter/api/v1/public/data/clients?AppID=86f32f1151354e7cb39c12f8ab2c22a3&AppVersion=1.17.3600.0-43058264&AppEnvironment=a01927f7421a4d4995673fe30ef46945&UploadType=eteventstream&SessionID=8E1D8A1E47004BFCD2038997DC852D42, HTTP code: 502, content length: 122, actual payload size: 122, elapsed: 9.49s
LogEOSSDK: Warning: LogHttp: 00000209758DAE00 Response Header Date: Tue, 17 Jun 2025 19:15:16 GMT
LogEOSSDK: Warning: LogHttp: 00000209758DAE00 Response Header Content-Type: text/html
LogEOSSDK: Warning: LogHttp: 00000209758DAE00 Response Header Content-Length: 122
LogEOSSDK: Warning: LogHttp: 00000209758DAE00 Response Header Connection: keep-alive
LogEOSSDK: Warning: LogHttp: 00000209758DAE00 Response Header Server: eos-gateway
LogEOSSDK: Warning: LogEOS: Error response received from backend. Response is not JSON. ServiceName=[Metrics], OperationName=[SendBackendEvent], Url=[], HttpStatus=[502], CorrId=
LogNet: Warning: UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 30.00, Real: 30.00, Good: 30.00, DriverTime: 332.65, Threshold: 30.00, [UNetConnection] RemoteAddr: 68.218.74.3:15027, Name: IpConnection_0, Driver: Name:IpNetDriver_0 Def:BeaconNetDriver IpNetDriver_0, IsServer: NO, PC: NULL, Owner: ValkyrieBeaconClient_0, UniqueId: MCP:37a216a5cca84ca2b661e5bbd14a8626
LogNet: Error: UEngine::BroadcastNetworkFailure: FailureType = ConnectionTimeout, ErrorString = UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 30.00, Real: 30.00, Good: 30.00, DriverTime: 332.65, Threshold: 30.00, [UNetConnection] RemoteAddr: 68.218.74.3:15027, Name: IpConnection_0, Driver: Name:IpNetDriver_0 Def:BeaconNetDriver IpNetDriver_0, IsServer: NO, PC: NULL, Owner: ValkyrieBeaconClient_0, UniqueId: MCP:37a216a5cca84ca2b661e5bbd14a8626, Driver = Name:IpNetDriver_0 Def:BeaconNetDriver IpNetDriver_0
LogValkyrieRequestManagerEditor: Warning: Encountered Network Error!
LogValkyrieRequestManagerEditor: Error: Failed to handle connection attempt (Network error occurred when connecting to a server after matchmaking completed. Error: UNetConnection::Tick: Connection TIMED OUT. Closing connection.. Elapsed: 30.00, Real: 30.00, Good: 30.00, DriverTime: 332.65, Threshold: 30.00, [UNetConnection] RemoteAddr: 68.218.74.3:15027, Name: IpConnection_0, Driver: Name:IpNetDriver_0 Def:BeaconNetDriver IpNetDriver_0, IsServer: NO, PC: NULL, Owner: ValkyrieBeaconClient_0, UniqueId: MCP:37a216a5cca84ca2b661e5bbd14a8626)
LogExit: Name:IpNetDriver_0 Def:BeaconNetDriver IpNetDriver_0 shut down

Server error again - response is not JSON and timeout.

9

Today, the Failed to cook issue was resolved for me. When I launched the editor after the 36.10 update, it told me it needs 5+GB space when I only have 3GB free. I made some space and launched the project. There was no cook error, only timeout.

I then deleted 200+ assets (fortnite props) and was able to launch the session.

10

I was hoping for a video. Never known this and i was thinking you could have the world record for the only person killed in the portal lobby :rofl:

Glad they fixed it for you tho :slight_smile:

11

Yes, it’s activated, I’ll try to deactivate it when I get back tonight to see if it works, but I don’t understand why it only happens on a “specific island” and if it works when I deactivate the “streaming” option, can I reactivate it afterwards?

Oh yes, I’ve also taken over an old version with “revision control”, everything works, I can launch the game, etc., but every time I make a new modification (small or large), move an object, etc., it resets the same error message.

12

I have streaming on, I only turned it off once to test some time ago.

13

Where did you see that you needed 5GB for your project? And how did you add more ( GB )?

14

I got the message on UEFN launch. I deleted screenshots and promotional videos I made to free up space.