Can't launch UEFN session

[LarYye]

Summary

When I start the session, it beggings the loading but cancels the session. I tried to open the session both in pc and in xbox, but the session just disconnects.

It keeps showing those errors
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/STW/STW_Irwin/STW_Irwin.uplugin failed to transition with error GameFeaturePlugin.StateMachine.WaitingForDependencies.Failed_Dependency_Transition
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/STW/STW_Irwin/STW_Irwin.uplugin failed to transition with error GameFeaturePlugin.StateMachine.WaitingForDependencies.Failed_Dependency_Transition
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogValkyrieAccount: [UValkyrieOnlineInstance::ApplyUserPreferredQoSRegion] Region Auto: BR
LogOnlineSession: Warning: MCP: FindSingleSession request failed. Invalid response. code=404 error={
“errorCode” : “errors.com.epicgames.modules.matchmaking.unknown_session”,
“errorMessage” : “unknown session id d3d99ef41eb0491ab71b5f5e73c6771f”,
“messageVars” : [ “d3d99ef41eb0491ab71b5f5e73c6771f” ],
“numericErrorCode” : 12101,
“originatingService” : “fortnite”,
“intent” : “prod-live”
}
LogOnline: Warning: OSS: Async task ‘FOnlineAsyncTaskMcpFindSingleSession bWasSuccessful: 0’ failed in 0.125152 seconds
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/STW/STW_Irwin/STW_Irwin.uplugin failed to transition with error GameFeaturePlugin.StateMachine.WaitingForDependencies.Failed_Dependency_Transition
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/STW/STW_Irwin/STW_Irwin.uplugin failed to transition with error GameFeaturePlugin.StateMachine.WaitingForDependencies.Failed_Dependency_Transition
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData
LogGameFeatures: Error: Dependency file:…/…/…/FortniteGame/Plugins/GameFeatures/SaveTheWorld/SaveTheWorld.uplugin failed to transition with error GameFeaturePlugin.StateMachine.Registering.Plugin_Missing_GameFeatureData

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Other, Matchmaking, Session not starting

Steps to Reproduce

• Open the UEFN project
• “Live editing” turned on
• “Start game automatically” turned off
• Launch the session (“connect to platform” option or the “open on this computer” option)

Expected Result

Open the session of the game in the creative edit mode

Observed Result

The editor starts loading the session, but cancel it and disconnects

Platform(s)

PC and Xbox One

[willthythrill]

I’m having same Problem for 2 days.

[LarYye]

It also shows this error

LogDADUserOptions: Error: Missing expected DAD Creative User Options primary asset:DefaultCosmetics. Make sure the UDAD_CreativeUserOptions and UPlaylistUserOptionDAD have matching CreativeUserOptionsListName and the UDAD_CreativeUserOptions is in the primary assets list.
LogCoopNotesSidePanel: Error: Invalid browser Widget when load completed
LogCoopNotesSidePanel: Error: Invalid browser Widget when load completed

[Jimbohalo10]

@LarYye

Missing expected DAD Creative User Options primary asset

This is quite an obscure error.
Someone posted on a similar problem

LogDADUserOptions: Error: Missing expected DAD Creative User Options primary asset:DefaultCosmetics. Make sure the UDAD_CreativeUserOptions and UPlaylistUserOptionDAD have matching CreativeUserOptionsListName and the UDAD_CreativeUserOptions is in the primary assets

The solution was

Turns out there was a imported prop that had its collision all crazy

see post

Constantly spawning in the water when loading a session - General / Issues and Bug Reporting - Epic Developer Community Forums (unrealengine.com)

[LarYye]

thanks for replying
the only stuffs i imported were some textures, i removed all of them and their references in game but still didn’t work

[LarYye]

i created a new blank project and tried to start the session, the same error still happens, so that’s not a problem of a specific project

i uninstalled and reinstalled both the game and uefn editor, also did verify the files on the epic games laucher, but nothing changed

[Jimbohalo10]

Hi @LarYye ,

Looks like you have done everything.
The final thing to do is clear the temp store for your projects.

Some posters have suggested this is too complex, but little is left to do.

31.20 [Solved] UEFN Fix Validation Error pop up wont “Run”

[LarYye]

i manually deleted the temp files, restarted the pc, issue still persists

there are also a lot of errors appearing when i open the project, most about not finding a lot of files or paths not existing on disk, it’s a very huge list

I wonder if i format my pc then it will somehow work

[Jimbohalo10]

i @LarYye ,

Create a new project and Migrate your original project into a new project.

Do you use HLOD in your project? If the HLOD break the whole project

This will pull in all the links and fix them as it’s installed.
have you checked for any reference assets that have been added from the FAB store?
If you have deleted them and re-connect

Format PC is a bit extreme, but if you do reformat put Windows 10 on instead of Windows 11.
UE 5.5 standard uses Windows 10.

[LarYye]

about the hlod, you mean i have to deactivate it?
i dind’t use any fab store asset, it was alll from the uefn default assets

also, i did create a whole new blank project, without migrating any of my actual project stuffs, but even in this new project the issues happens

[LarYye]

I solved the error about the save the world files, had to enable and install it from the epic games launcher, also verified the uefn files again

But now the issue remaining is this one when i try to launch, it loads but disconnects, then shows these warnings:

LogUObjectGlobals: Warning: Failed to find object ‘Class /Script/MediaPlate.MediaPlateResource’
LogNet: Warning: Channel name will be serialized as a string: ValkyrieBeacon
LogHttp: Warning: HttpRetry: Resetting log verbosity to Warning due to requests being retried

When I try to load the second time, it shows this:

LogOnlineSession: Warning: MCP: FindSingleSession request failed. Invalid response. code=404 error={
“errorCode” : “errors.com.epicgames.modules.matchmaking.unknown_session”,
“errorMessage” : “unknown session id d82f903575c04491a649be0d813ccad2”,
“messageVars” : [ “d82f903575c04491a649be0d813ccad2” ],
“numericErrorCode” : 12101,
“originatingService” : “fortnite”,
“intent” : “prod-live”
}
LogOnline: Warning: OSS: Async task ‘FOnlineAsyncTaskMcpFindSingleSession bWasSuccessful: 0’ failed in 0.123488 seconds
LogValkyrieAccount: [UValkyrieOnlineInstance::ApplyUserPreferredQoSRegion] Region Auto: BR
LogValkyrie: ProjectSizeRequest::GetDependencyDownloadSizes for de8ab965-4682-0b7f-c5c4-778351763f50
LogValkyrie: ProjectSizeRequest::Completed for de8ab965-4682-0b7f-c5c4-778351763f50
LogNet: Warning: Channel name will be serialized as a string: ValkyrieBeacon

[LarYye]

showing very long list of the other errors that appears when i open the project

[LarYye]

but once i try to lauch the game, that huge list doesn’t repeat

the only errors repeating are these ones from this reply

[LarYye]

oh it worked once, i changed the island settings from simulate a new user to import live data, but when i tried to launch the session a second time it didn’t work

[LarYye]

i changed back to simulate a new user and launched, but it didn’t worked

then i changed back again to import live data, launched, it opened the default uefn map but didn’t open my map and came back to lobby, almost worked

in a third time, launched the map again and it worked

i think i’m close to solve the issue

[LarYye]

Now i can run the blank project, but still trying to fix my map

It keeps showing this error again (it was not appearing in the blank project)

LogDADUserOptions: Error: Missing expected DAD Creative User Options primary asset:DefaultCosmetics. Make sure the UDAD_CreativeUserOptions and UPlaylistU
serOptionDAD have matching CreativeUserOptionsListName and the UDAD_CreativeUserOptions is in the primary assets list.

I keep deleting assets but can’t find the one causing this error

[LarYye]

the problem was the hlod asset, i deleted it and i copied manually the project to a new one

it launched the project once, keeps disconnecting and showing this

LogOnlineSession: Warning: MCP: FindSingleSession request failed. Invalid response. code=404 error={
“errorCode” : “errors.com.epicgames.modules.matchmaking.unknown_session”,
“errorMessage” : “unknown session id 11adcf479faf412c9afbb0737ac3c79d”,
“messageVars” : [ “11adcf479faf412c9afbb0737ac3c79d” ],
“numericErrorCode” : 12101,
“originatingService” : “fortnite”,
“intent” : “prod-live”
}
LogOnline: Warning: OSS: Async task ‘FOnlineAsyncTaskMcpFindSingleSession bWasSuccessful: 0’ failed in 0.124530 seconds

[willthythrill]

Hey LarYye, go to editor Click on Tools click on Audit statistics see what happens. I crash Evering time I click on it.

[LarYye]

@willthythrill

vering time I click

it also crashes for me

[willthythrill]

I finally was able to get this warning messages to show up today. Disabled Use Unreal Revision Control by New projects on Editor Preferences seem to me the revision control hides it.
Disable it and restart your UEFN again. Just BECAREFUL reposting the warning message it holds information about your account. not sure how to fix it.

ErrorCode=errors.com.epicgames.online.generic.connection_failure, Message=Connection to the server failed., Raw=connection_failure
[2024.10.09-17.35.59:052][384]LogOnline: Warning: MCP: Invalid response. CorrId=FN-UwBHJn7BEEurkcXbLyXmUg code=0 error=Failure ErrorCode=errors.com.epicgames.online.generic.connection_failure, Message=Connection to the server failed., Raw=connection_failure
ErrorCode=errors.com.epicgames.online.generic.connection_failure, Message=Connection to the server failed., Raw=connection_failure
[2024.10.09-17.35.59:055][384]LogEOSSDK: Error: LogEOSAuth: Ignoring failed attempt to verify active authentication session due to an unexpected error. Error: EOS_OperationWillRetry UserId: 9d8…4b2
[2024.10.09-17.35.59:056][384]LogEOSSDK: Error: LogEOSMessaging: Failed to connect to EpicConnect. Error=[Could not initialize connection] LocalUserId=[9d8…4b2] StompClient=[00000B128743F000]
[2024.10.09-17.35.59:254][386]LogEOSSDK: Warning: LogEOSMessaging: Failed to connect to EpicConnect service due to EOS_UnexpectedError. Trying again in 5.00 seconds.
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