Cook error when trying to Launch Edit session

Aeryn · April 18, 2025, 7:58pm

Summary

LogValkyrie: Display: ProjectSizeRequest::CancelFlow for b691794d-44cc-4f68-e0ad-efb149aca9f2 - Content (re)cook error errors.com.epicgames.cookplugin.assetvalidationerror.
JOB_ID=75d8ae73-dd72-42e7-a5f4-869c7363ab13
LogValkyrieRequestManagerEditor: Detected cook failure, cook job id ea9d72ab-b025-43ee-98f5-3b9e376a2505
LogValkyrieSummary: Server Summary - Failed to distribute content due to (Failure ErrorCode=ContentBeaconV2.FailedToBuildManifestServer.Host We hit an error while cooking this content
cook_failure, ClientId:Server, RequestId:187FBC2B1DDC421BB5D964236C7ACE78, InnerErrorCode:errors.com.epicgames.content-service.cook_failure, InnerErrorMessage:An error occurred while communicating with the game servers (failed to cook module b691794d-44cc-4f68-e0ad-efb149aca9f2 (artifact f4261656-e3fb-4787-8043-01535ab9a1a9:linux-server) (cookJobId ea9d72ab-b025-43ee-98f5-3b9e376a2505) with error code errors.com.epicgames.cookplugin.assetvalidationerror)., CachedInnerErrorType:EInnerErrorType::CookFailure, AdditionalErrorParams:(CookJobId,ea9d72ab-b025-43ee-98f5-3b9e376a2505)(RequestDescriptio
n,project 44ba2062-4a54-df92-a461-5a93c508297a root b691794d-44cc-4f68-e0ad-efb149aca9f2@656), Message=Extended error, Raw=ContentBeaconV2.FailedToBuildManifestServer.Host We hit an error while cooking this content
cook_failure, ClientId:Server, RequestId:187FBC2B1DDC421BB5D964236C7ACE78, InnerErrorCode:errors.com.epicgames.content-service.cook_failure, InnerErrorMessage:An error occurred while communicating with the game servers (failed to cook module b691794d-44cc-4f68-e0ad-efb149aca9f2 (artifact f4261656-e3fb-4787-8043-01535ab9a1a9:linux-server) (cookJobId ea9d72ab-b025-43ee-98f5-3b9e376a2505) with error code errors.com.epicgames.cookplugin.assetvalidationerror)., CachedInnerErrorType:EInnerErrorType::CookFailure, AdditionalErrorParams:(CookJobId,ea9d72ab-b025-43ee-98f5-3b9e376a2505)(RequestDescriptio
n,project 44ba2062-4a54-df92-a461-5a93c508297a root b691794d-44cc-4f68-e0ad-efb149aca9f2@656))
LogValkyrieRequestManagerEditor: Detected cook failure, cook job id ea9d72ab-b025-43ee-98f5-3b9e376a2505
PlatformCook: Error: We hit an error while cooking this content
PlatformCook: Error: errors.com.epicgames.content-service.cook_failure
PlatformCook: Error: CookJobId:ea9d72ab-b025-43ee-98f5-3b9e376a2505
PlatformCook: Error: An error occurred while communicating with the game servers (failed to cook module b691794d-44cc-4f68-e0ad-efb149aca9f2 (artifact f4261656-e3fb-4787-8043-01535ab9a1a9:linux-server) (cookJobId ea9d72ab-b025-43ee-98f5-3b9e376a2505) with error code errors.com.epicgames.cookplugin.assetvalidationerror).
LogValkyrieEditorAnalytics: Displaying Stats for Flow
LogValkyrieEditorAnalytics: =========================
LogValkyrieEditorAnalytics: Flow=Play
LogValkyrieEditorAnalytics: PlayFlow=160.469
LogValkyrieEditorAnalytics: ↳ PrepareProjectSourceData=17.374
LogValkyrieEditorAnalytics: ↳ ProjectUpload=15.353
LogValkyrieEditorAnalytics: ↳ SyncWithContentService=1.784
LogValkyrieEditorAnalytics: ↳ UpdateProjectMetadata=0.700
LogValkyrieEditorAnalytics: ↳ StageProjectModules=0.981
LogValkyrieEditorAnalytics: ↳ GatherFilesForValidation=0.001
LogValkyrieEditorAnalytics: ↳ DownloadPublishedVerseFiles=3.079
LogValkyrieEditorAnalytics: ↳ ValidateProject=4.890
LogValkyrieEditorAnalytics: ↳ FindServer=5.088
LogValkyrieEditorAnalytics: ↳ MatchmakingToServer=1.915
LogValkyrieEditorAnalytics: ↳ UploadCookDownload=138.007
LogValkyrieEditorAnalytics: ↳ ProjectUpload=56.279
LogValkyrieEditorAnalytics: ↳ SyncWithContentService=1.856
LogValkyrieEditorAnalytics: ↳ UpdateProjectMetadata=0.703
LogValkyrieEditorAnalytics: ↳ StageProjectModules=0.953
LogValkyrieEditorAnalytics: ↳ PruneScratchSpaceFiles=5.849
LogValkyrieEditorAnalytics: ↳ UploadFiles=1.910
LogValkyrieEditorAnalytics: ↳ CreateModuleVersions=41.043
LogValkyrieEditorAnalytics: ↳ StoreSnapshot=0.692
LogValkyrieEditorAnalytics: ↳ ServerClientCookUnloadLoad=81.729
LogValkyrieEditorAnalytics: =================================
LogValkyrieActivityTracker: Warning: Session → Fail Activity: LoadingNewContent - Error updating content
LogValkyrieSummary: Failed to update content due to error.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Assets

Steps to Reproduce

Launching a session

Expected Result

No errors

Observed Result

Cooking error

Platform(s)

UEFN

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el_dud3rlno · April 24, 2025, 11:14pm

I’m having this same issue, were you able to resolve it.

Guy3000s · April 28, 2025, 1:38pm

have also been having this issue since last week on a rocket racing map
If I revert back to the state that I pushed my last working build I can launch a edit session however any change to that projects still results in this error. So I am currently unable to make any updates to that map
Many posts on the UEFN discord and here about it but yet to see any solutions that work for me.

Drew_Vol · April 29, 2025, 4:05am

I am having the same issue here, started just a few days ago. If anyone finds a solution, please share

Aeryn · April 29, 2025, 11:57am

UPDATE :
I tried a couple things and nothing worked. So I created a snapshot of my project using Unreal Revision Control. As a last resort, I then deleted the Saved and Intermediate folders located in “AppData > Local > UnrealEditorFortnite” after closing UEFN.

When I reopened UEFN, all my Editor settings were reset including my Project Folders location (from my F:// drive to my C:// drive) which showed me a “Sync” button under my project that I just backed up to Unreal Revision Control. Clicking Sync downloaded my project to my Drive again from my latest Unreal Revision Control snapshot. Now I had two folders (MyProject and a duplicate MyProject_).

After syncing, I tried to launch a session from the duplicate MyProject_. I got some Validation errors which I never got with my original project when launching and it pointed me to the device that was causing an issue in the Message Log. It had something to do with a popup dialog device still using a deleted widget reference that I had missed earlier. So I deleted that device from my original project and it launched without cook errors.

Important Note: Deleting the Saved and Intermediate folders can result in the loss of unsaved data. It’s advisable to back up everything before proceeding. This could affect your other projects as well (make sure all your projects are backed up by Unreal Revision Control as well just in case). This approach worked for me, but it might not be suitable for everyone.

Mine was a an “assetvalidationerror” and it might be different for you.