Failed to Cook

General Issues and Bug Reporting
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21

Can also confirm it’s back and I am unable to push changes.

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22

Over 12 hours with this issue

23

started happening again this morning worked yesterday but this morning on the same map with nothing changed bam broken

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24

also started getting this error today

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25

also

26

same

27

Just wanna mention i created the epic ui template island and it also fails so i think its on epics side not our islands

28

issue is now back for everyone

29

Issue seems fixed but pushing verse is so slow!!!

2 Likes
30

Hi @iFlone: Could you share your session ID so that we can look into this?

31

Im having this issue too. I added 350 scene graph prefabs and I cant cook since yesterday. Is there a prefab limit?

32

Hello! Where would I find this?

33

Hi there: this should be in your editor logs. Alternatively, you can also send your editor logs to Epic by going to [Help > Report Issue] in the UEFN editor top menu bar.

1 Like
34

Is “reference id” what you looking for? “cd269e4d-4436-9cce-162a-86aef05ae7c1” or this “82fafa0b-4a2f-1e07-2beb-18a12551b9aa”

35

Hey sonictke

Ever since this bug was introduced on this date at this time, our island is unable to be played on Switch, PS4 and Xbox 1, All URC versions after this date are broken on last gen console.

I traced our last-gen (Switch/PS4/Xbox One) issue back to July 20:

  • v2748 – 9:37am → Works fine (can load private sessions on Switch).

  • v2749 – 9:38am → Broken, and every build after (even empty maps).

That exact morning (7/20), everyone was hit by a cook error across devices:

Out-of-order slow task construction/destruction: destroying 'Matchmaking ...' but 'Uploading Assets' is at the top of the stack
LogValkyrie: Error: FlowStep_ResolveSessionCandidate ... failed validation with error: [http_error_500: valkyrie-cook-api.prod.ucs.on.epicgames.com]

When I launch a session on Switch, I get the error above, and when I create a private code I get “Network Connection Lost” I cannot even matchmake into our island.

It was briefly fixed an hour later, but since then all Kraken builds after v2749 fail on console, always with that same error.

Relevant threads:

Because it reproduces on empty projects, this feels like a backend module validation problem tied to the July 20 cook/URC update, not our content.

Reproduction 1

  • Account ID: dd1d12142d7f48b0a940d0de0237231d,

  • Attempted to load in at: 7:38pm EDT 9/18,

  • Crashed at: 7:41pm EDT 9/18,

  • Device: PS4,

  • This is a backup account and should not have any other sessions from this time,

Reproduction 2

  • Account ID: 183ba30eed2e4aa788253dc6c44abd24,

  • Attempted to load in at: 6:55pm EDT 9/18,

  • Crashed at: 6:58pm EDT 9/18,

  • Device: Nintendo Switch,

  • This is my main account and there will likely be lots of other sessions