# Cooking error when launching session (I need help please, I have been unable to solve this for a week)

**URL:** <https://forums.unrealengine.com/t/cooking-error-when-launching-session-i-need-help-please-i-have-been-unable-to-solve-this-for-a-week/2566346>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, bug-report, editor, fortnite, Cooking-Failed\
**Created:** [June 19, 2025, 3:45pm UTC](https://forums.unrealengine.com/t/cooking-error-when-launching-session-i-need-help-please-i-have-been-unable-to-solve-this-for-a-week/2566346 "2025-06-19T15:45:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![besthillex](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@besthillex](https://forums.unrealengine.com/u/besthillex)\
**Post date:** [June 19, 2025, 3:45pm UTC](https://forums.unrealengine.com/t/cooking-error-when-launching-session-i-need-help-please-i-have-been-unable-to-solve-this-for-a-week/2566346/1 "2025-06-19T15:45:38Z")

</div>

### Summary

Hello,  
I’ve been stuck on my project for several days due to a session launch error. I’ve checked my materials, textures, assets, Niagara Systems, imported meshes… I’ve even deleted things from the world to see if that would fix it — still nothing works. The output log doesn’t tell me what’s wrong; it just says something is wrong.

I’m honestly going crazy with this issue. Between the stress of not being able to solve it and the heat, it’s getting really hard not to feel desperate.

Please, if anyone has any idea what might be going on, I’d be so grateful for your help.  
Thank you very much in advance.

The error is as follows:  
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  
PlatformCook: Error: Hemos encontrado un error mientras se producía el contenido  
PlatformCook: Error: errors.com.epicgames.content-service.cook\_failure  
PlatformCook: Error: CookJobId:9db72a33-09ae-4dfa-9e07-8ba9b729caff;1062610b-4ec6-4ce2-9fe9-bd95ad7a528c;7ae2c56b-f4a4-43c6-bcd5-047b7e1b6938;5c18bb14-b892-4c0d-9789-4a2567201f17;fdaddcc9-4572-40c0-893d-6588a6256658;f40672c6-5412-42d6-b279-5987e34bcffa;a3d7b006-1439-4e85-b400-d434ca5248b2;363e5841-3fb6-4e1b-8d09-e656a2255ab5;49e22f12-c2f8-4323-939a-c62bea9f4e0b;604fc4a1-77a7-4bc2-819f-61133d75dcaf;05666384-a5f8-4657-80c2-c1c697e0c161;da457153-a234-4bb6-ba63-e66862d2af6c;c0ba4ded-c410-4500-ad8c-50e3c38a5150;5e74fc0f-4ca1-43c7-8a11-c6c3047b342e;579e97e5-bbe4-4357-a538-44d03ceac59b;4b7a39f6-148b-  
41b5-aae3-2cc30834b82b;11998d1e-7f38-4aff-9d8b-0ebe4d3be459;843deae5-29af-4c91-8ee6-041080c72b40;302cf8b5-32a1-4f45-877c-7a225005469e;c9c040e3-adae-46f8-9560-7bf2de125ef7;2ddfddc0-e5a5-4e75-a9c3-394b4f8f8ad6;f4c47c1d-0a30-4ac9-bd04-397a78325ba1;20d41ac1-c486-4a1c-bec5-b93dda840b3c;01f3a12d-a1e0-4197-b782-344f4ef9f226;57f49279-7b7c-4996-8309-b574cca37a81;410a4f20-22cc-4064-912a-1159ef334d72;3739e840-36d3-4376-89e0-9b0e602c4237;81539e70-e9a8-467c-b10a-0f603b5e4ffe;b3b95c69-e5fb-4c9d-b511-79ea3e7fc91c;2a7e0536-7f07-44a7-a5da-230b726428b4;2ba01d8a-5895-4fde-a199-e227d56547c8;577b4db2-14fd-45c3-88e  
2-463380f00e3d;25a38c87-4260-49d3-9abe-74af3b7c3fe3;c027dcbf-7a09-4ca8-9d66-b56b6ff91cc5;a9702ee1-04d1-4d8c-a3f3-f6d3420b4d07;1eb3f7bd-60da-4f24-9743-29fb4b14506c;9af1bf7e-d39f-417f-a877-ecb7b10655f4;473c556f-6c38-4818-9fa9-58770a2c43bc;62fd6b9a-54a6-4aae-a19e-d9a65abac49d;32bfc8cc-ee40-4949-9ee2-eb4dc13add53;12f0a9b0-313c-4f1c-83ee-d101398982c3;e75fe44c-43a6-496c-8c17-a242a0204547;f189d01f-fa77-4fdc-8839-3bfb911516c7;0188f4d6-d039-423c-b0e2-3ad37d997271;87ad6566-e8f4-4d21-89a2-565bb0fc5bde;cd359d10-3326-48c2-b41f-b0e71c058c7f;3f0224e2-df50-4ce3-9154-00218a8de8eb;dc8ab414-1b29-44bc-9ace-b88df2  
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d-80d9-85e26cf59388;150183ec-e4ae-4ada-a9a1-e71a512abccc;4c2808a9-b548-4b0e-ae64-38fbe8b7391d;52d0281f-3dc5-4010-a8a7-ab167ed1a022;bd07c3e9-3c30-4d34-a8fc-e2c961f5c80f;3aa29e2b-e4fc-45e9-a2d9-c1bb62e7ec12;3ab03948-d276-49cd-9916-43212f321e7c;6dec2531-524a-4c58-abb0-6d06289cb491;249f8857-c08f-4e9b-bbac-245e47847504;5b7a5b82-c144-4f52-9d68-4850cb63c054;24cb7b4b-1afc-482f-9677-e1f34a3cf617;c56cb784-3a81-407f-b15b-ff80ed37e750;56e3be1c-6ddb-4b24-9afe-0052b2e4cbee;49585f03-9973-44a5-8e65-b9ca1e3e631c;82b66239-69e8-4bb1-91cc-4561c35f3f3c;dadad7eb-a973-4086-af9b-56c2b24d9d38;3c7aae20-3024-4ce0-90e9-e  
a6b4dc3de85;0717f82d-b9ae-4f7c-974a-211c7d53491f;3a38cb92-abb7-4c0b-8854-e5da38b0164a;4dec9ec0-39e5-4e13-9ddd-58dbb039aad6;4100154b-5364-4a81-a0e3-860b1a3a6d23;e32540d9-234a-412a-9b82-d92f5a56a8d9;026a5f69-6204-4586-8b61-140333aba783;c8007e73-4efa-48f4-98aa-44d442415c21;78035fd0-abe1-4012-b871-b9de39103cbc;ab96fff0-3632-44cc-8a20-f157b7272417;dccbc6a8-5069-4b66-94a2-42eb3490b3bf;a4f64555-ee59-4604-9e5a-a39f5269a587;85a98e59-defb-4dff-9a00-db17daae1b99;84a9ff17-e792-41d1-b745-2583da965708;c55ea2ab-b345-4bf7-a8ab-429474a90e90;c81fa15e-255e-4fc8-94b3-5d8bbec5ba57;f10b6cdf-dbbb-46f7-8e72-26b861d1e  
54c;35789845-3033-4913-945f-8c95d937702c;19d96686-86f6-4bae-97ad-5f248ccb44ae;c4259dea-69c9-40c7-955f-2b75e7c51072;ed61a4fb-33e3-4836-88c1-c18dafdc6331;5e7a99b7-8aba-4c26-a9fb-8827a8c6feeb;57f19b6b-c829-4a4a-a6d1-34af52a1e326;aaaf3883-0bc9-48a5-ad06-001f1885412b;44d04d06-ab1a-482e-85b2-926a8eb7ec3e;35070fff-9cb5-4aef-b1b7-d4720a15fbcd;5c08ae07-bdc4-4e0b-8222-7cbec63402d6;9f0ff79a-460c-40ad-b348-d91fa94ec71a;6afde2a1-d845-43b2-87dd-e199bc19c4c6;4a22082d-9bcc-4d31-bcb4-72786be38027;21051884-b862-4079-bb10-9f9e776047d9;bf5a3b61-ea5c-4065-b823-50ba40ff0090;71816f95-7ab0-4a04-9815-8495f710ac79;835c  
e052-e194-4529-819b-7ec20e0d576a;9a6a73af-f13a-4947-a7e6-98ea8ac69881;77af0df5-629b-4636-992d-def61b1f98b8;ff4d9ef0-73fb-4b9b-a6de-4f1829e509d7;a4e1bc24-2d88-44d0-948f-7677e2ffb881;248d12c5-aa7c-4723-b05e-d9d6d80f736a;c8f52699-6764-403a-9f96-33a00c7a25f5;9d45bdbe-ac82-46f6-a586-9e0f92457a0b;1fb1b362-f573-4e33-94f4-34647bc633d4;bfe03663-f789-41a8-ab50-f0175996961b;5b66843c-ba1f-41dc-b03e-301d2cf85d19;72eba38b-f1b1-439f-ae22-13f6a64880ef;39e6d56b-9ca3-4d1e-a936-b269f040d00f;0332bbc7-3181-4d46-b0c5-01105ebb4929;8725a7b0-d37d-45a2-96b0-a8ae4bb6f5a9;73dd014c-61e4-46dd-aec4-ed2802011bae;174b867d-5b4  
4-4361-a3aa-1309e4e8e96d;87cb08ac-274a-4293-bc21-55aab0e32577;3805ecea-2f08-4817-8fbe-a86ee67f983e;3eb53a62-623c-4840-a7cc-ad5bce28311a;b61b05e9-01aa-44b0-a25d-38c55ae9eb98;72dbe9e2-0023-4903-9365-54a4435cc95b;7d0ae477-b770-4fb3-a7a0-dd134c941a2b;61be6cdc-7361-46c4-8580-07044205b855;500b37f8-8a9e-4efe-8eea-165a1afe8c6a;7ec3fc44-9d74-4a76-914f-accc83a64dc7;ad1bcff3-c746-44a0-b3b3-c33108b73647;0df6a344-4b98-4439-a26d-11bb89004ad4;2730e164-fa10-49a0-af96-e5e10fdc496a;c45b6b1b-e8bc-4d91-a315-1d0747edabda;9adc1240-149d-4f78-80f7-235b1c2ced6b;884a5706-3c49-446d-8e13-53fd5e97ed90;6d8aa5f4-9de0-4399-8  
9f0-51185f1430c9;13608795-a0f9-46cc-b3f6-e144736e18ad;8db82dc1-b2ec-4c10-bd89-6f92cbd92d48;45fda5fb-7046-4235-ae69-e20cdeece911;4b4d5047-d499-4a42-bc3a-857591502177;e29bd0ac-171d-4d10-9b71-0f9d2e00b416;4e4e1865-775d-40a5-a31f-8a4c77aeed06;32fdf905-fb85-4a80-80b6-a6f5fa913b9d;99dae15b-9215-4cf8-8084-67b940e199ec;e24cf758-0867-4bd0-a956-312302efb4ab;4a72b907-74f9-4490-8630-c2e7109f9779;f693dcc0-2ad3-4169-b3fc-3a058a499208;3ce90402-7f48-416a-8588-517d8ebe0eee;4efffc23-66c9-4645-abed-d7b9f3907b5a;86dcb9c6-007d-4831-b571-39cc8f94b170;d6b59702-1cee-414a-a265-cab1fef66a9b;7c2b9098-b693-4f5b-8bf2-141b  
e2eadc28;461c8d27-9b9e-40a4-bb7c-92479206355d;23001ac4-3ae8-4293-aad9-b08c785c4277;be04602b-2d0b-4bc5-9f73-82840bbb7bcd;b540d702-bcfd-47e6-a5ee-ee3a5d457181;acaab7c8-bc80-4c73-b42f-da90ce44a153;ba7a990f-d2d5-466b-8683-fbb2895c381d;8d54cc17-b0b8-409f-ac50-91c96e81ef2d;b36dfcc0-7ab3-4c05-889f-280e8756b718;c6d5173a-2a52-4b56-89f9-c82ffc456b31;a68534ed-75a8-48cc-8e35-8e1737b31ebf;a3e8ef24-c5d9-40c5-a277-7ca859c40e46;2faae2f5-342e-4874-ae93-fb3da7fcf24f;024c2503-f9af-4761-8672-998396aa99c4;01c7192f-5e51-4690-93d9-0fa9d1db6429;e8f0269b-2bd6-4067-9391-2b7b6f01873c  
PlatformCook: Error: Se ha producido un error al comunicarse con los servidores del juego (failed to cook module cae7bafd-4f55-d587-e1e6-48a302011367 (artifact 37344b80-df08-4043-a187-8e73b975a5cb:linux-server) (cookJobId e8f0269b-2bd6-4067-9391-2b7b6f01873c) with error code errors.com.epicgames.cookplugin.assetvalidationerror)

### Please select what you are reporting on:

Unreal Editor for Fortnite

### What Type of Bug are you experiencing?

Assets

### Steps to Reproduce

Open UEFN  
Launch Session

### Expected Result

When you start the session, the island will open so you can test it.

### Observed Result

The observed result is that in Fortnite it says “Edit Mode. Error” and in UEFN it says Hemos encontrado un error mientras se producía el contenido  
errors.com.epicgames.content-service.cook\_failure  
CookJobId:9db72a33-09ae-4dfa-9e07-8ba9b729caff;1062610b-4ec6-4ce2-9fe9-bd95ad7a528c;7ae2c56b-f4a4-43c6-bcd5-047b7e1b6938;5c18bb14-b892-4c0d-9789-4a2567201f17;fdaddcc9-4572-40c0-893d-6588a6256658;f40672c6-5412-42d6-b279-5987e34bcffa;a3d7b006-1439-4e85-b400-d434ca5248b2;363e5841-3fb6-4e1b-8d09-e656a2255ab5;49e22f12-c2f8-4323-939a-c62bea9f4e0b;604fc4a1-77a7-4bc2-819f-61133d75dcaf;05666384-a5f8-4657-80c2-c1c697e0c161;da457153-a234-4bb6-ba63-e66862d2af6c;c0ba4ded-c410-4500-ad8c-50e3c38a5150;5e74fc0f-4ca1-43c7-8a11-c6c3047b342e;579e97e5-bbe4-4357-a538-44d03ceac59b;4b7a39f6-148b-41b5-aae3-2cc30834b82b;11998d1e-7f38-4aff-9d8b-0ebe4d3be459;843deae5-29af-4c91-8ee6-041080c72b40;302cf8b5-32a1-4f45-877c-7a225005469e;c9c040e3-adae-46f8-9560-7bf2de125ef7;2ddfddc0-e5a5-4e75-a9c3-394b4f8f8ad6;f4c47c1d-0a30-4ac9-bd04-397a78325ba1;20d41ac1-c486-4a1c-bec5-b93dda840b3c;01f3a12d-a1e0-4197-b782-344f4ef9f226;57f49279-7b7c-4996-8309-b574cca37a81;410a4f20-22cc-4064-912a-1159ef334d72;3739e840-36d3-4376-89e0-9b0e602c4237;81539e70-e9a8-467c-b10a-0f603b5e4ffe;b3b95c69-e5fb-4c9d-b511-79ea3e7fc91c;2a7e0536-7f07-44a7-a5da-230b726428b4;2ba01d8a-5895-4fde-a199-e227d56547c8;577b4db2-14fd-45c3-88e2-463380f00e3d;25a38c87-4260-49d3-9abe-74af3b7c3fe3;c027dcbf-7a09-4ca8-9d66-b56b6ff91cc5;a9702ee1-04d1-4d8c-a3f3-f6d3420b4d07;1eb3f7bd-60da-4f24-9743-29fb4b14506c;9af1bf7e-d39f-417f-a877-ecb7b10655f4;473c556f-6c38-4818-9fa9-58770a2c43bc;62fd6b9a-54a6-4aae-a19e-d9a65abac49d;32bfc8cc-ee40-4949-9ee2-eb4dc13add53;12f0a9b0-313c-4f1c-83ee-d101398982c3;e75fe44c-43a6-496c-8c17-a242a0204547;f189d01f-fa77-4fdc-8839-3bfb911516c7;0188f4d6-d039-423c-b0e2-3ad37d997271;87ad6566-e8f4-4d21-89a2-565bb0fc5bde;cd359d10-3326-48c2-b41f-b0e71c058c7f;3f0224e2-df50-4ce3-9154-00218a8de8eb;dc8ab414-1b29-44bc-9ace-b88df27dee05;32297709-0b9f-4d79-b55c-c32a8c16104a;6631392e-e722-4a85-bddc-44de05e031df;41a39c8c-29cc-495b-952f-bd2078e9dc0c;e4320df9-c1af-4a9f-9c63-a4037fa6dae2;f51ff652-e160-49a1-b9fc-4cebfe758891;3f7d99ba-aec0-438d-b55b-f2b9d396e133;acb8055a-c18a-45c3-a599-c0e98977a0a3;1d47be78-84bb-4b77-a0e7-2fc78176a0ba;a8a0ad36-9d1a-4857-8976-a9371eaa56d4;3e78b854-b6f2-40dd-921f-faf95fcc4b5a;96744474-972f-4dde-8b43-4a61ed68892e;44fee10b-0eef-4989-8800-6968465b8c8f;34962045-98b1-462b-814a-99729317abcf;7c58beb4-7a6a-46bc-8cf4-05c99cec3e06;14ad6c66-d3d9-4837-bb92-6383a30c4baf;be48005c-c25a-48e2-9b7d-4eef9874ff19;9c7e2ffe-51a9-4665-b6da-e00058b379ab;07a48566-4c42-4b25-a21b-07e09d9522c6;4824586a-c50a-4365-86b7-5bbafe568771;4dd011b1-0dd7-42bc-96fa-1f8881c368b0;2940695e-2241-4882-a8b9-b56932476cb3;41b6b6a3-3d48-4dcf-b539-8c38b2330a04;18ba6c5f-9d97-4f52-b758-8c7f4c276fe3;1cb73404-f736-4fb9-8fca-c8681f604706;2149118d-b861-4868-9255-28145044ff37;ca8df0cd-82c7-485e-bb91-661dbe97b53c;d9f5d0e9-9af1-4540-861c-73bfc6882c85;b76ddeb4-7dc6-41ac-a780-7d53785baf39;7673c8fe-bf62-4b14-a754-9807290607fa;ac42efa3-06bb-4ae0-be9f-a8cb1914ab65;0ac101c1-0838-426e-b2a8-3ecfd5b59f0f;bbe73522-3919-4b88-827a-3ea5c605c2be;d458fc07-c9dd-4f48-af0e-5b4702b235d7;28d0a061-456c-4c7b-96c5-4bb5ae4e2e4e;ddd2557b-b943-4b9a-bc7b-c7e29978ab84;b28edd2b-3ba5-4faa-9c24-c97e4c0dfc7b;76a5c74c-9916-4748-9ca4-7c3f07e53aae;0de478bc-f45f-483d-b21a-7874251625bf;6d89f2fb-e2c3-4017-9358-9f0ce9ca5a8d;3dcbf518-905b-49f7-bcab-6c8b4035b175;5cfdb383-2bc7-40af-a89c-e013455aa1c1;5f4b85b7-ef37-4505-9c12-5f4420f3fddb;d7e4afa8-aa35-423c-80b5-d64fee6c3f3e;cd255467-6db5-418d-b6b5-0dfdafee2a11;3da69999-65c2-4f98-b170-764b2bffe8df;643805d5-3234-41a0-a83d-03e7a47036cc;1ed0d07b-4567-4671-a825-503007ff5324;7d8431db-2fe7-4d1c-96ff-2b9644d2023a;d1c10482-b79b-421d-80d9-85e26cf59388;150183ec-e4ae-4ada-a9a1-e71a512abccc;4c2808a9-b548-4b0e-ae64-38fbe8b7391d;52d0281f-3dc5-4010-a8a7-ab167ed1a022;bd07c3e9-3c30-4d34-a8fc-e2c961f5c80f;3aa29e2b-e4fc-45e9-a2d9-c1bb62e7ec12;3ab03948-d276-49cd-9916-43212f321e7c;6dec2531-524a-4c58-abb0-6d06289cb491;249f8857-c08f-4e9b-bbac-245e47847504;5b7a5b82-c144-4f52-9d68-4850cb63c054;24cb7b4b-1afc-482f-9677-e1f34a3cf617;c56cb784-3a81-407f-b15b-ff80ed37e750;56e3be1c-6ddb-4b24-9afe-0052b2e4cbee;49585f03-9973-44a5-8e65-b9ca1e3e631c;82b66239-69e8-4bb1-91cc-4561c35f3f3c;dadad7eb-a973-4086-af9b-56c2b24d9d38;3c7aae20-3024-4ce0-90e9-ea6b4dc3de85;0717f82d-b9ae-4f7c-974a-211c7d53491f;3a38cb92-abb7-4c0b-8854-e5da38b0164a;4dec9ec0-39e5-4e13-9ddd-58dbb039aad6;4100154b-5364-4a81-a0e3-860b1a3a6d23;e32540d9-234a-412a-9b82-d92f5a56a8d9;026a5f69-6204-4586-8b61-140333aba783;c8007e73-4efa-48f4-98aa-44d442415c21;78035fd0-abe1-4012-b871-b9de39103cbc;ab96fff0-3632-44cc-8a20-f157b7272417;dccbc6a8-5069-4b66-94a2-42eb3490b3bf;a4f64555-ee59-4604-9e5a-a39f5269a587;85a98e59-defb-4dff-9a00-db17daae1b99;84a9ff17-e792-41d1-b745-2583da965708;c55ea2ab-b345-4bf7-a8ab-429474a90e90;c81fa15e-255e-4fc8-94b3-5d8bbec5ba57;f10b6cdf-dbbb-46f7-8e72-26b861d1e54c;35789845-3033-4913-945f-8c95d937702c;19d96686-86f6-4bae-97ad-5f248ccb44ae;c4259dea-69c9-40c7-955f-2b75e7c51072;ed61a4fb-33e3-4836-88c1-c18dafdc6331;5e7a99b7-8aba-4c26-a9fb-8827a8c6feeb;57f19b6b-c829-4a4a-a6d1-34af52a1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 
Se ha producido un error al comunicarse con los servidores del juego (failed to cook module cae7bafd-4f55-d587-e1e6-48a302011367 (artifact 1cbe2380-6fd6-467f-9441-5a2503a57527:linux-server) (cookJobId d6457d57-8ebe-481b-8586-81b60afbb92d) with error code errors.com.epicgames.cookplugin.assetvalidationerror)

### Platform(s)

Pc - Windows 11

### Video

> **[Unreal Editor 2025-06-19 17-42-26.mp4](https://drive.google.com/file/d/1Nca56bzvZ7Ue6fWtFCEM3rr4veCZiYCj/view?usp=sharing)**
>
> Google Drive file.

---

<div class="post-metadata">

**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\
**Post date:** [December 16, 2025, 3:46pm UTC](https://forums.unrealengine.com/t/cooking-error-when-launching-session-i-need-help-please-i-have-been-unable-to-solve-this-for-a-week/2566346/2 "2025-12-16T15:46:28Z")

</div>

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