# \#Cooking-Failed **URL:** https://forums.unrealengine.com/tag/cooking-failed/5746.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [Internal Error - Cooker Timeout errors.com.epicgames.cookplugin.heartbeattimeout 42.20](https://forums.unrealengine.com/t/internal-error-cooker-timeout-errors-com-epicgames-cookplugin-heartbeattimeout-42-20/2832972)
**Author:** [@pate0321](https://forums.unrealengine.com/u/pate0321)\ **Replies:** 1\ **Last updated:** [September 25, 2026, 5:58pm UTC](https://forums.unrealengine.com/t/internal-error-cooker-timeout-errors-com-epicgames-cookplugin-heartbeattimeout-42-20/2832972 "2026-09-25T17:58:13Z")
Summary My UEFN project passes Verse compilation, Windows cooking, memory calculation, and UEFN Publishing Validation. However, Creator Portal blocks release creation with: Internal Error – Cooker Timeout. errors.com.epi… --- ## [Crash during cook: BspMode module asserts on FSlateApplication::Get() in headless commandlet (UE 5.8.1)](https://forums.unrealengine.com/t/crash-during-cook-bspmode-module-asserts-on-fslateapplication-get-in-headless-commandlet-ue-5-8-1/2744590)
**Author:** [@Greguwu](https://forums.unrealengine.com/u/Greguwu)\ **Replies:** 1\ **Last updated:** [August 25, 2026, 5:42pm UTC](https://forums.unrealengine.com/t/crash-during-cook-bspmode-module-asserts-on-fslateapplication-get-in-headless-commandlet-ue-5-8-1/2744590 "2026-08-25T17:42:38Z")
Summary When packaging a project, the cook step crashes with an assertion failure in FSlateApplication::Get(). The crash occurs because FBspModeModule::StartupModule() calls FEditorClassUtils::GetTooltip(), which creates… --- ## [Cooking failed when trying to package project ](https://forums.unrealengine.com/t/cooking-failed-when-trying-to-package-project/2728026)
**Author:** [@SIRTOA](https://forums.unrealengine.com/u/SIRTOA)\ **Replies:** 1\ **Last updated:** [June 11, 2026, 7:09pm UTC](https://forums.unrealengine.com/t/cooking-failed-when-trying-to-package-project/2728026 "2026-06-11T19:09:48Z")
I will included the log file below but every time I try to package my project, i get a cooking fail error. Please help! It would be greatly appreciated! Here the error log below: Log started at 6/11/2026 7:25:26 AM (20… --- ## [UE5.7.1 ProjectLauncher Packaging Error when build .pak file](https://forums.unrealengine.com/t/ue5-7-1-projectlauncher-packaging-error-when-build-pak-file/2693661)
**Author:** [@DaVinci\_13](https://forums.unrealengine.com/u/DaVinci_13)\ **Replies:** 5\ **Last updated:** [January 28, 2026, 2:36am UTC](https://forums.unrealengine.com/t/ue5-7-1-projectlauncher-packaging-error-when-build-pak-file/2693661 "2026-01-28T02:36:23Z")
Hi, I’m trying to build .pak file by UE5.7.1 Project Launcher. But I get some error when packaging. Both mac and windows. There is my package config. And there is the error log: \*\*\*\*\*\*\*\*\*\* COOK COMMAND COMPL… --- ## [PackagingResults:Error: Error Unknown Cook Failure](https://forums.unrealengine.com/t/packagingresults-error-unknown-cook-failure/342171)
**Author:** [@anonymous\_user\_34605e88](https://forums.unrealengine.com/u/anonymous_user_34605e88)\ **Replies:** 26\ **Last updated:** [January 25, 2026, 6:05pm UTC](https://forums.unrealengine.com/t/packagingresults-error-unknown-cook-failure/342171 "2026-01-25T18:05:24Z")
When i package for windows 64 bit it going through and at the end it says in message log PackagingResults:Error: Error Unknown Cook Failure My build config in on Shipping i package for windows 64 bit --- ## [Unreal 5.7.1 Cooking Stuck (Windows 64-bit)](https://forums.unrealengine.com/t/unreal-5-7-1-cooking-stuck-windows-64-bit/2693383)
**Author:** [@vexe](https://forums.unrealengine.com/u/vexe)\ **Replies:** 2\ **Last updated:** [January 19, 2026, 8:16pm UTC](https://forums.unrealengine.com/t/unreal-5-7-1-cooking-stuck-windows-64-bit/2693383 "2026-01-19T20:16:11Z")
We upgrade from 5.6 to 5.7.1 because some landscape tools we’re using were fixed in 5.7.1. For some reason now we can’t cook our project (Windows 64-bit). I’ve tried deleting Saved/Intermediate/Binary/DerivedDataCached … --- ## [UE4 Android “Unknown Cook Failure / ExitCode=1” – FIX ](https://forums.unrealengine.com/t/ue4-android-unknown-cook-failure-exitcode-1-fix/2689038)
**Author:** [@vinayaknirantar](https://forums.unrealengine.com/u/vinayaknirantar)\ **Replies:** 0\ **Last updated:** [January 1, 2026, 9:58pm UTC](https://forums.unrealengine.com/t/ue4-android-unknown-cook-failure-exitcode-1-fix/2689038 "2026-01-01T21:58:32Z")
:white\_check\_mark: UE4 Android “Unknown Cook Failure / ExitCode=1” – FIX Problem UE4 Android packaging fails with: Unknown Cook Failure ExitCode=1 DoesPackageExist FAILED Component class is not set Even after: Mig… --- ## [\[MAJOR\] Connection Timed Out/Cooking Error when launching project session.](https://forums.unrealengine.com/t/major-connection-timed-out-cooking-error-when-launching-project-session/2685470)
**Author:** [@IconicStudio](https://forums.unrealengine.com/u/IconicStudio)\ **Replies:** 1\ **Last updated:** [December 16, 2025, 3:11pm UTC](https://forums.unrealengine.com/t/major-connection-timed-out-cooking-error-when-launching-project-session/2685470 "2025-12-16T15:11:29Z")
Summary This project is a tycoon game. A verse device named TycoonManager manages a base of around 3000 actors using an array of 500 indexes of a Basic\_Buyable class, used to manage the tycoon base. With one base, the is… --- ## [Platform Cook error when preparing platform data before Publishing Project,](https://forums.unrealengine.com/t/platform-cook-error-when-preparing-platform-data-before-publishing-project/2604117)
**Author:** [@PAKPrime](https://forums.unrealengine.com/u/PAKPrime)\ **Replies:** 2\ **Last updated:** [October 23, 2025, 4:28pm UTC](https://forums.unrealengine.com/t/platform-cook-error-when-preparing-platform-data-before-publishing-project/2604117 "2025-10-23T16:28:54Z")
Summary I am about to publish my project when i receive Switch: Failed to prepare data for PROJECTNAME ValkyriePreparedPlatformData: Error: Switch: Failed to prepare data for PROJECTNAME. I edit afterwards by removing… --- ## [RR track Failure to cook](https://forums.unrealengine.com/t/rr-track-failure-to-cook/2657309)
**Author:** [@1-DUCK-1](https://forums.unrealengine.com/u/1-DUCK-1)\ **Replies:** 0\ **Last updated:** [September 16, 2025, 8:02pm UTC](https://forums.unrealengine.com/t/rr-track-failure-to-cook/2657309 "2025-09-16T20:02:25Z")
Summary Tried both clean and my version with only placed items, only mine fails to cook. tried deleting everything, still getting the error. Please select what you are reporting on: Unreal Editor for Fortnite What Typ… --- ## [Cook Failure outputsentry.failed](https://forums.unrealengine.com/t/cook-failure-outputsentry-failed/2623456)
**Author:** [@Pokeasy](https://forums.unrealengine.com/u/Pokeasy)\ **Replies:** 2\ **Last updated:** [August 13, 2025, 5:45pm UTC](https://forums.unrealengine.com/t/cook-failure-outputsentry-failed/2623456 "2025-08-13T17:45:38Z")
Summary When I click the “Launch Session” button in UEFN, it shows this cook error “outputsentry.failed” Please select what you are reporting on: Unreal Editor for Fortnite What Type of Bug are you experiencing? Other … --- ## [Platform Cook error when preparing platform data when Publishing Project](https://forums.unrealengine.com/t/platform-cook-error-when-preparing-platform-data-when-publishing-project/2618298)
**Author:** [@PAKPrime](https://forums.unrealengine.com/u/PAKPrime)\ **Replies:** 1\ **Last updated:** [August 2, 2025, 2:20pm UTC](https://forums.unrealengine.com/t/platform-cook-error-when-preparing-platform-data-when-publishing-project/2618298 "2025-08-02T14:20:47Z")
Summary I am about to publish my project when i receive Switch: Failed to prepare data for PROJECTNAME ValkyriePreparedPlatformData: Error: Switch: Failed to prepare data for PROJECTNAME. I edit afterwards by removing… --- ## [Random Cook error appeared ](https://forums.unrealengine.com/t/random-cook-error-appeared/2387601)
**Author:** [@DW.Im\_Good.Trust](https://forums.unrealengine.com/u/DW.Im_Good.Trust)\ **Replies:** 3\ **Last updated:** [July 18, 2025, 4:05am UTC](https://forums.unrealengine.com/t/random-cook-error-appeared/2387601 "2025-07-18T04:05:11Z")
Summary One day I was working on my project as normal, the next day before making any changes I tried to start a session and got a cooking error. Anytime I have tried loading a session since I have gotten the same error.… --- ## [Unable to cook my project](https://forums.unrealengine.com/t/unable-to-cook-my-project/2600152)
**Author:** [@Mythical\_Pixel](https://forums.unrealengine.com/u/Mythical_Pixel)\ **Replies:** 2\ **Last updated:** [July 15, 2025, 10:21pm UTC](https://forums.unrealengine.com/t/unable-to-cook-my-project/2600152 "2025-07-15T22:21:19Z")
Hi I am trying to cook my project as a windows .exe file to be able to share my project with a friend, but whenever I try to cook/ship it It seems to always fail and gives me a unknown cook fail with exit code 25. I adde… --- ## [Cooking error when launching session (I need help please, I have been unable to solve this for a week)](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)
**Author:** [@besthillex](https://forums.unrealengine.com/u/besthillex)\ **Replies:** 0\ **Last updated:** [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 "2025-06-19T15:45:38Z")
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 … --- ## [Error while cooking this content problem.](https://forums.unrealengine.com/t/error-while-cooking-this-content-problem/2549985)
**Author:** [@G1o2g3h](https://forums.unrealengine.com/u/G1o2g3h)\ **Replies:** 2\ **Last updated:** [June 10, 2025, 11:02pm UTC](https://forums.unrealengine.com/t/error-while-cooking-this-content-problem/2549985 "2025-06-10T23:02:04Z")
Whenever I try to launch a session, a error with cooking this content pops up which does not let me launch a session. This only happens with this specific project, my other ones I can perfectly launch session. Look at th… --- ## [PlatformCook Error while loading into a UEFN session](https://forums.unrealengine.com/t/platformcook-error-while-loading-into-a-uefn-session/2270433)
**Author:** [@Volviik](https://forums.unrealengine.com/u/Volviik)\ **Replies:** 6\ **Last updated:** [May 27, 2025, 2:14pm UTC](https://forums.unrealengine.com/t/platformcook-error-while-loading-into-a-uefn-session/2270433 "2025-05-27T14:14:48Z")
Summary I am unable to launch a session on Windows. When launching a session on my current project, everything goes as expected but after waiting at least 10 minutes, I receive an error message informing me that on the … --- ## [Crash during deploy to iOS](https://forums.unrealengine.com/t/crash-during-deploy-to-ios/2519240)
**Author:** [@sarah\_j\_smith](https://forums.unrealengine.com/u/sarah_j_smith)\ **Replies:** 6\ **Last updated:** [May 26, 2025, 4:42am UTC](https://forums.unrealengine.com/t/crash-during-deploy-to-ios/2519240 "2025-05-26T04:42:55Z")
Hi all, Thanks so much for reading. Environment: Build - MacBook Pro Arm CPU / Deploy - iPhone 11 Pro Max. Unreal Engine: 5.5.1, PaperZD, Paper2D. I’m trying to get a game to run on iPhone but the cooking process cau… --- ## [error when launching session](https://forums.unrealengine.com/t/error-when-launching-session/2476079)
**Author:** [@G1o2g3h](https://forums.unrealengine.com/u/G1o2g3h)\ **Replies:** 3\ **Last updated:** [May 15, 2025, 1:08pm UTC](https://forums.unrealengine.com/t/error-when-launching-session/2476079 "2025-05-15T13:08:46Z")
Summary whenever i try to launch session, this error shows up in the message log: We hit an error while cooking this content errors.com.epicgames.content-service.cook\_failure CookJobId:c09a93ce-4f7e-41e9-bd1b-3883fd13f… --- ## [How can I fix this cooking error during my packaging?](https://forums.unrealengine.com/t/how-can-i-fix-this-cooking-error-during-my-packaging/461115)
**Author:** [@Drugox](https://forums.unrealengine.com/u/Drugox)\ **Replies:** 2\ **Last updated:** [May 10, 2025, 1:53am UTC](https://forums.unrealengine.com/t/how-can-i-fix-this-cooking-error-during-my-packaging/461115 "2025-05-10T01:53:45Z")
Hi, last week I was testing my game’s LAN matches, and for that it required a packaged version of it to run the openlevel command to go from the lobby to the arena. So everytime I had to adjust something in the project I… --- ## [Cook Errors when starting session in UEFN?](https://forums.unrealengine.com/t/cook-errors-when-starting-session-in-uefn/2484114)
**Author:** [@Spigon6](https://forums.unrealengine.com/u/Spigon6)\ **Replies:** 1\ **Last updated:** [April 30, 2025, 10:15pm UTC](https://forums.unrealengine.com/t/cook-errors-when-starting-session-in-uefn/2484114 "2025-04-30T22:15:51Z")
Summary HI, working on a map in UEFN, and every time I try to start a session, I get the following errors; We hit an error while cooking this content errors.com.epicgames.content-service.cook\_failure CookJobId:ab5ba46… --- ## [Unknown Cook Failure ERROR?](https://forums.unrealengine.com/t/unknown-cook-failure-error/1671224)
**Author:** [@ssophia\_lee](https://forums.unrealengine.com/u/ssophia_lee)\ **Replies:** 1\ **Last updated:** [April 12, 2025, 6:54am UTC](https://forums.unrealengine.com/t/unknown-cook-failure-error/1671224 "2025-04-12T06:54:26Z")
Hi I am trying to package a game for windows and this was the error message. It had been cooking for about 20 minutes so I thought everything would be fine… If anyone could help figure how to fix it It would be so greatl… --- ## [LogWindows: Error: appError called: Assertion failed: Actor-\>GetLevel()](https://forums.unrealengine.com/t/logwindows-error-apperror-called-assertion-failed-actor-getlevel/1833864)
**Author:** [@AltairGamesLLC](https://forums.unrealengine.com/u/AltairGamesLLC)\ **Replies:** 4\ **Last updated:** [March 15, 2025, 2:02am UTC](https://forums.unrealengine.com/t/logwindows-error-apperror-called-assertion-failed-actor-getlevel/1833864 "2025-03-15T02:02:01Z")
I get these errors during the cooking process using the ProjectLauncher. LogOutputDevice: Warning: Script Stack (0 frames) : LogWindows: Error: appError called: Assertion failed: Actor-\>GetLevel() == this \[File:D:\\… --- ## [How to fix the error "Ensure condition failed: SessionInterface.IsUnique()"](https://forums.unrealengine.com/t/how-to-fix-the-error-ensure-condition-failed-sessioninterface-isunique/727277)
**Author:** [@BIGSUNGG](https://forums.unrealengine.com/u/BIGSUNGG)\ **Replies:** 7\ **Last updated:** [March 14, 2025, 8:13pm UTC](https://forums.unrealengine.com/t/how-to-fix-the-error-ensure-condition-failed-sessioninterface-isunique/727277 "2025-03-14T20:13:11Z")
Hello, I have a problem that getting this error when cooking my project I want solution of this problem Im using UE5.1 LogOutputDevice: Error: === Handled ensure: === LogOutputDevice: Error: Ensure condition failed: … --- ## [Incomplete Installation and Missing Files Specific to My Epic Creator Account Preventing Proper Use of Fortnite and UEFN Since October 2023](https://forums.unrealengine.com/t/incomplete-installation-and-missing-files-specific-to-my-epic-creator-account-preventing-proper-use-of-fortnite-and-uefn-since-october-2023/2260100)
**Author:** [@PledgedRanger](https://forums.unrealengine.com/u/PledgedRanger)\ **Replies:** 9\ **Last updated:** [February 6, 2025, 6:49pm UTC](https://forums.unrealengine.com/t/incomplete-installation-and-missing-files-specific-to-my-epic-creator-account-preventing-proper-use-of-fortnite-and-uefn-since-october-2023/2260100 "2025-02-06T18:49:39Z")
Summary Install Epic Games Launcher, Fortnite, and Unreal Editor for Fortnite (UEFN) on a clean, updated Windows installation. Launch UEFN and attempt to load or create a project. Observe persistent errors related to m… --- ## [Cooking-Failed in LyraStarterGame](https://forums.unrealengine.com/t/cooking-failed-in-lyrastartergame/1197018)
**Author:** [@Azuen5411](https://forums.unrealengine.com/u/Azuen5411)\ **Replies:** 3\ **Last updated:** [January 26, 2025, 3:34am UTC](https://forums.unrealengine.com/t/cooking-failed-in-lyrastartergame/1197018 "2025-01-26T03:34:48Z")
I’m experiencing a failed cook when trying to package a project based off of Lyra. The Output Log gives me this: UATHelper: Cooking (Windows): LogOutputDevice: Error: begin: stack for UAT UATHelper: Cooking (Windows)… --- ## [Unknown cook failure](https://forums.unrealengine.com/t/unknown-cook-failure/1841132)
**Author:** [@WaijuGames](https://forums.unrealengine.com/u/WaijuGames)\ **Replies:** 1\ **Last updated:** [January 21, 2025, 3:29am UTC](https://forums.unrealengine.com/t/unknown-cook-failure/1841132 "2025-01-21T03:29:36Z")
Hello everyone, i got an unknown cook failure and i’m struggling to understand why. Here is the full log : ProjectT.log (560.4 KB) And here is just the warnings and errors : PackagingResults: Warning: Engine.ini:\[Cor… --- ## [Cooking Failed due to Using Engine Content UE 5.5](https://forums.unrealengine.com/t/cooking-failed-due-to-using-engine-content-ue-5-5/2268205)
**Author:** [@vyzor](https://forums.unrealengine.com/u/vyzor)\ **Replies:** 1\ **Last updated:** [January 14, 2025, 12:33am UTC](https://forums.unrealengine.com/t/cooking-failed-due-to-using-engine-content-ue-5-5/2268205 "2025-01-14T00:33:22Z")
Hello everyone! Since i updated to UE 5.5 i’ve been having this issue. it seems that engine content can’t be Cooked? it says it was marked nevercooked, and i cannot find anywhere how to unmark it. quite frustratin… --- ## [Android packaging error ](https://forums.unrealengine.com/t/android-packaging-error/2067968)
**Author:** [@NicoNicoNi007](https://forums.unrealengine.com/u/NicoNicoNi007)\ **Replies:** 2\ **Last updated:** [October 28, 2024, 9:48am UTC](https://forums.unrealengine.com/t/android-packaging-error/2067968 "2024-10-28T09:48:57Z")
Similar to this problem PackagingResults: Error: no matching function for call to ‘asuint’ - Programming & Scripting / Blueprint - Epic Developer Community Forums (unrealengine.com) --- ## [unreal engine android issues exporting precompiled shaders or cook content](https://forums.unrealengine.com/t/unreal-engine-android-issues-exporting-precompiled-shaders-or-cook-content/2018326)
**Author:** [@Ariel\_Gimenez](https://forums.unrealengine.com/u/Ariel_Gimenez)\ **Replies:** 0\ **Last updated:** [September 12, 2024, 9:54pm UTC](https://forums.unrealengine.com/t/unreal-engine-android-issues-exporting-precompiled-shaders-or-cook-content/2018326 "2024-09-12T21:54:38Z")
Hello, does anyone know how to cook the unreal shader for mobile before exporting the project to Android? I am having a serious problem, the shaders compile on the mobile, they are not exported precompiled then the fir… [Next page](https://forums.unrealengine.com/tag/cooking-failed/5746.md?match_all_tags=true&page=1&tags%5B%5D=Cooking-Failed)