# \#critical-error **URL:** https://forums.unrealengine.com/tag/critical-error/10962.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… --- ## [Unable to Open Assets in Library from the Epic Game Launcher](https://forums.unrealengine.com/t/unable-to-open-assets-in-library-from-the-epic-game-launcher/2719930)
**Author:** [@trentpolack](https://forums.unrealengine.com/u/trentpolack)\ **Replies:** 1\ **Last updated:** [May 4, 2026, 3:17pm UTC](https://forums.unrealengine.com/t/unable-to-open-assets-in-library-from-the-epic-game-launcher/2719930 "2026-05-04T15:17:14Z")
Summary Unable to actually browse any assets in my library in the Epic Launcher; every time I try to open one in the launcher, I get an error screen (attached). What type of bug are you experiencing? Documentation Step… --- ## [Unable to Launch Session RESOLVED](https://forums.unrealengine.com/t/unable-to-launch-session-resolved/2706454)
**Author:** [@Majorrblues](https://forums.unrealengine.com/u/Majorrblues)\ **Replies:** 7\ **Last updated:** [April 24, 2026, 10:00pm UTC](https://forums.unrealengine.com/t/unable-to-launch-session-resolved/2706454 "2026-04-24T22:00:42Z")
Summary For the past few days, I’ve been unable to log in to the session due to a critical internal cook error. This happens when I have the HLODS built for some reason—if I delete them, the session works, but then I can… --- ## [\[BUG\] Critical Error Array.h line 758 UE 5.4.3 and 5.4.4](https://forums.unrealengine.com/t/bug-critical-error-array-h-line-758-ue-5-4-3-and-5-4-4/1992209)
**Author:** [@Valentinvis](https://forums.unrealengine.com/u/Valentinvis)\ **Replies:** 7\ **Last updated:** [September 20, 2025, 7:11pm UTC](https://forums.unrealengine.com/t/bug-critical-error-array-h-line-758-ue-5-4-3-and-5-4-4/1992209 "2025-09-20T19:11:46Z")
//Edit: I’m starting with the edit because what I said below is still valid, but this error isn’t only for Project Launcher where I encountered it first, but I also got the error when trying to move a folder with lots of… --- ## [\*\*CRITICAL\*\*- Can't launch UEFN session after v36.00 - verse code Validation Fails, pointing to sys/published outdated code](https://forums.unrealengine.com/t/critical-cant-launch-uefn-session-after-v36-00-verse-code-validation-fails-pointing-to-sys-published-outdated-code/2546524)
**Author:** [@BushyBrowse](https://forums.unrealengine.com/u/BushyBrowse)\ **Replies:** 6\ **Last updated:** [June 8, 2025, 11:03am UTC](https://forums.unrealengine.com/t/critical-cant-launch-uefn-session-after-v36-00-verse-code-validation-fails-pointing-to-sys-published-outdated-code/2546524 "2025-06-08T11:03:37Z")
Summary After v36.00, UEFN has an issue with generating the proper updated code from our files to our Project’s ‘…/Plugins/…/sys/’ folder. Causing validation to fail - leaving the project broken. (Cannot launch a session… --- ## [Error on packaging](https://forums.unrealengine.com/t/error-on-packaging/475855)
**Author:** [@rusty1001](https://forums.unrealengine.com/u/rusty1001)\ **Replies:** 1\ **Last updated:** [February 1, 2024, 12:54pm UTC](https://forums.unrealengine.com/t/error-on-packaging/475855 "2024-02-01T12:54:43Z")
Hello folks, I’ve tried to look for an answer for this, but it’s beyond me. Can anyone help? UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: begin: stack for UAT UATHelper: Packaging (Windows (64-bit)): … --- ## [Private Version for Project Not accessible](https://forums.unrealengine.com/t/private-version-for-project-not-accessible/1326603)
**Author:** [@defcon117](https://forums.unrealengine.com/u/defcon117)\ **Replies:** 3\ **Last updated:** [October 10, 2023, 4:36pm UTC](https://forums.unrealengine.com/t/private-version-for-project-not-accessible/1326603 "2023-10-10T16:36:07Z")
Uploading of private version seems to be successful, BUT unable to view on the creator portal. Receive a 504 error for the project. I have check over projects, they are fine. Thus I am unable to publish this map. Steps: … --- ## [Problem when packaging](https://forums.unrealengine.com/t/problem-when-packaging/489140)
**Author:** [@lanternedigitale](https://forums.unrealengine.com/u/lanternedigitale)\ **Replies:** 2\ **Last updated:** [August 14, 2023, 7:08am UTC](https://forums.unrealengine.com/t/problem-when-packaging/489140 "2023-08-14T07:08:31Z")
I try to package my game but I keep getting errors, that I do not understand and I do not know what to look for when trying to resolve that! The Log: LogMagicLeap: Warning: VDZI enabled, but can’t load the ml\_remote DL… --- ## [Please Help! Assertion failed: Result.ok() , Failed to create Peer Connection. Msg=ICE server parse failed](https://forums.unrealengine.com/t/please-help-assertion-failed-result-ok-failed-to-create-peer-connection-msg-ice-server-parse-failed/1177838)
**Author:** [@Devilondetails](https://forums.unrealengine.com/u/Devilondetails)\ **Replies:** 4\ **Last updated:** [June 10, 2023, 9:59am UTC](https://forums.unrealengine.com/t/please-help-assertion-failed-result-ok-failed-to-create-peer-connection-msg-ice-server-parse-failed/1177838 "2023-06-10T09:59:59Z")
So, I have set up pixel streaming for one of my applications and it works fine on the local network but as soon as I try to access it using public IP and open the public IP, I get the HTML UI and click to start. But when… --- ## [UE4 Editor crashes when I open it without Dual / External Monitor connected](https://forums.unrealengine.com/t/ue4-editor-crashes-when-i-open-it-without-dual-external-monitor-connected/478107)
**Author:** [@anonymous\_user\_b220333c](https://forums.unrealengine.com/u/anonymous_user_b220333c)\ **Replies:** 2\ **Last updated:** [January 26, 2023, 10:41am UTC](https://forums.unrealengine.com/t/ue4-editor-crashes-when-i-open-it-without-dual-external-monitor-connected/478107 "2023-01-26T10:41:25Z")
I am having an issue with a project I created while my laptop was connected to a smart TV (Veon tv). I have been working on this project for some time now. Due to covid lockdown I have not disconnected my laptop from du… --- ## [Unable to instantiate UnrealEd module for non-editor targets](https://forums.unrealengine.com/t/unable-to-instantiate-unrealed-module-for-non-editor-targets/489377)
**Author:** [@\_vil\_videnz](https://forums.unrealengine.com/u/_vil_videnz)\ **Replies:** 1\ **Last updated:** [September 29, 2022, 10:12pm UTC](https://forums.unrealengine.com/t/unable-to-instantiate-unrealed-module-for-non-editor-targets/489377 "2022-09-29T22:12:44Z")
Hey Guys, apparently this is a common error and none of the posts that already exsisted had an answer/(or an answer that worked). So I wanted to revide it. When Packaging I get the following error: ERROR: Unable to inst… --- ## [Cooking Fails: BulkData compressed header](https://forums.unrealengine.com/t/cooking-fails-bulkdata-compressed-header/483029)
**Author:** [@Apple\_Aiden](https://forums.unrealengine.com/u/Apple_Aiden)\ **Replies:** 2\ **Last updated:** [July 30, 2022, 2:00pm UTC](https://forums.unrealengine.com/t/cooking-fails-bulkdata-compressed-header/483029 "2022-07-30T14:00:18Z")
Crash Report found here, primarily using some assets and the UATHelper: Cooking (Windows (64-bit)): LogThreadingWindows: Error: Runnable thread PoolThread 16 crashed. UATHelper: Cooking (Windows (64-bit)): LogWindow… --- ## [Packaging failed due to Assertion Failed ClassData](https://forums.unrealengine.com/t/packaging-failed-due-to-assertion-failed-classdata/498525)
**Author:** [@Capn\_C4ke](https://forums.unrealengine.com/u/Capn_C4ke)\ **Replies:** 0\ **Last updated:** [February 16, 2022, 12:48am UTC](https://forums.unrealengine.com/t/packaging-failed-due-to-assertion-failed-classdata/498525 "2022-02-16T00:48:11Z")
I’ve been trying to package my game but it keeps saying critical error. I was able to package it properly yesterday, and barely even touched anything today. I literally have no idea what’s going on, and I don’t have a re… --- ## [UE4 packaging critical error](https://forums.unrealengine.com/t/ue4-packaging-critical-error/490016)
**Author:** [@just\_nuts013](https://forums.unrealengine.com/u/just_nuts013)\ **Replies:** 0\ **Last updated:** [October 20, 2021, 12:41am UTC](https://forums.unrealengine.com/t/ue4-packaging-critical-error/490016 "2021-10-20T00:41:47Z")
Hi. I’m making a game exclusively for Oculus. Lastly, I’m trying to package it and run it. However, the next critical error occurs when the game start button is pressed after installing it in the Oculus. I think there is… --- ## [UnrealEngine 4 critical error](https://forums.unrealengine.com/t/unrealengine-4-critical-error/489767)
**Author:** [@qwertyuiop67515](https://forums.unrealengine.com/u/qwertyuiop67515)\ **Replies:** 0\ **Last updated:** [October 12, 2021, 1:09am UTC](https://forums.unrealengine.com/t/unrealengine-4-critical-error/489767 "2021-10-12T01:09:34Z")
Hello, this error only in gameplay\_layer editor when i try to move. Piece of crash\_log: \[2021.10.10-22.05.05:034\]\[ 20\]LogFileHelpers: Loading map ‘Grozny\_AAS’ took 24.342 \[2021.10.10-22.05.53:666\]\[291\]LogOutputDevice: … --- ## [Error on automated build](https://forums.unrealengine.com/t/error-on-automated-build/489295)
**Author:** [@Paul.Robson2002](https://forums.unrealengine.com/u/Paul.Robson2002)\ **Replies:** 0\ **Last updated:** [September 28, 2021, 11:32am UTC](https://forums.unrealengine.com/t/error-on-automated-build/489295 "2021-09-28T11:32:45Z")
Hello so when using Jenkins to run an automated build of our project we are getting a lot of call stack errors. This isn’t consistent and will sometimes run off fine, but other times it will not run and will exit with ex… --- ## [Need help troubleshooting MacOS crash on shipping build while loading level](https://forums.unrealengine.com/t/need-help-troubleshooting-macos-crash-on-shipping-build-while-loading-level/489051)
**Author:** [@thejturner](https://forums.unrealengine.com/u/thejturner)\ **Replies:** 0\ **Last updated:** [September 23, 2021, 2:13am UTC](https://forums.unrealengine.com/t/need-help-troubleshooting-macos-crash-on-shipping-build-while-loading-level/489051 "2021-09-23T02:13:33Z")
I’m trying to troubleshoot a user’s log after experiencing repeated crashes while loading streaming levels. This occurs on shipping and development builds. Any guidance would be appreciated. The issues seems to be the fo… --- ## [IOS from Windows - Install \\ Update of "XXX.ipa" failed with Unknown error 0xE8008029 now it has become Install \\ Update of "XXX.ipa" failed The identity used to sign the executable is no longer valid (0xE8008018)](https://forums.unrealengine.com/t/ios-from-windows-install-update-of-xxx-ipa-failed-with-unknown-error-0xe8008029-now-it-has-become-install-update-of-xxx-ipa-failed-the-identity-used-to-sign-the-executable-is-no-longer-valid-0xe8008018/483183)
**Author:** [@ADL67](https://forums.unrealengine.com/u/ADL67)\ **Replies:** 13\ **Last updated:** [September 22, 2021, 6:41am UTC](https://forums.unrealengine.com/t/ios-from-windows-install-update-of-xxx-ipa-failed-with-unknown-error-0xe8008029-now-it-has-become-install-update-of-xxx-ipa-failed-the-identity-used-to-sign-the-executable-is-no-longer-valid-0xe8008018/483183 "2021-09-22T06:41:48Z")
Hi, I have problem to deploy from Win10 with Unreal 4.26 to Ipad (IOS 14.6). No problem until IOS 14.3 but now I have serious problems to deploy on IPAD from Unreal and transferring .IPA too. The project are blueprint o… --- ## [Critical Error every render Movie Render Queue](https://forums.unrealengine.com/t/critical-error-every-render-movie-render-queue/487800)
**Author:** [@ItsSharp](https://forums.unrealengine.com/u/ItsSharp)\ **Replies:** 0\ **Last updated:** [August 22, 2021, 5:32am UTC](https://forums.unrealengine.com/t/critical-error-every-render-movie-render-queue/487800 "2021-08-22T05:32:12Z")
Hi I was wondering if anyone could help me solve this random error I keep getting. Anytime I go to render in the Movie Render Queue I get multiple errors. I running 4.26.2 from the launcher and I haven’t touched any of t… --- ## [HISM causes crash in build/standalone on reload level](https://forums.unrealengine.com/t/hism-causes-crash-in-build-standalone-on-reload-level/476371)
**Author:** [@powderblue67](https://forums.unrealengine.com/u/powderblue67)\ **Replies:** 18\ **Last updated:** [August 13, 2021, 9:33am UTC](https://forums.unrealengine.com/t/hism-causes-crash-in-build-standalone-on-reload-level/476371 "2021-08-13T09:33:29Z")
I’m working on a game, think endless runner. For environment meshes I’m using HISM. They get created in the Construction script. The basic loading logic is in the screenshot attached. The game has a restart button that… --- ## [Linux Server crashes on joining](https://forums.unrealengine.com/t/linux-server-crashes-on-joining/487209)
**Author:** [@magerbeton](https://forums.unrealengine.com/u/magerbeton)\ **Replies:** 0\ **Last updated:** [August 9, 2021, 10:20pm UTC](https://forums.unrealengine.com/t/linux-server-crashes-on-joining/487209 "2021-08-09T22:20:28Z")
So as the game is still in the early stages of development I wanted to use a virtual machine with ubuntu to test the server. The server starts and everything is fine until a client tries to join: \[2021.08.08-22.04.52:25… --- ## [Linux packaging fails](https://forums.unrealengine.com/t/linux-packaging-fails/480161)
**Author:** [@SasMaster](https://forums.unrealengine.com/u/SasMaster)\ **Replies:** 4\ **Last updated:** [April 3, 2021, 7:41am UTC](https://forums.unrealengine.com/t/linux-packaging-fails/480161 "2021-04-03T07:41:46Z")
Hi. I am cross-compiling a project to Linux target from windows. I took a basic scene from Industrial/Architecture templates. Nothing else in the scene but the compass mesh which is a part of SunSky BP. The compilation s… --- ## [Crash on Oculus when streaming is enabled](https://forums.unrealengine.com/t/crash-on-oculus-when-streaming-is-enabled/476277)
**Author:** [@WisE\_DRL](https://forums.unrealengine.com/u/WisE_DRL)\ **Replies:** 1\ **Last updated:** [March 25, 2021, 9:35pm UTC](https://forums.unrealengine.com/t/crash-on-oculus-when-streaming-is-enabled/476277 "2021-03-25T21:35:36Z")
My game is asserting when I try to enable streaming of submaps. It seems to be related to streaming out of a previous submap. Here is the assert. Since this is on the Oculus, we aren’t using type of volumetic fog or a… --- ## [=== Critical error: ===](https://forums.unrealengine.com/t/critical-error/479191)
**Author:** [@usmanahmed1988](https://forums.unrealengine.com/u/usmanahmed1988)\ **Replies:** 0\ **Last updated:** [February 28, 2021, 5:21pm UTC](https://forums.unrealengine.com/t/critical-error/479191 "2021-02-28T17:21:03Z")
i have disabled plugins and deleted all folders like intermediate and binaries folder but still getting this error while packaging the project. ATHelper: Packaging (Windows (64-bit)): LogWindows: Error: === Critical e… --- ## [I'm using async loading screen for my game and this random crash occurs?](https://forums.unrealengine.com/t/im-using-async-loading-screen-for-my-game-and-this-random-crash-occurs/478368)
**Author:** [@xopac](https://forums.unrealengine.com/u/xopac)\ **Replies:** 0\ **Last updated:** [February 7, 2021, 8:33pm UTC](https://forums.unrealengine.com/t/im-using-async-loading-screen-for-my-game-and-this-random-crash-occurs/478368 "2021-02-07T20:33:50Z")
I’m using the same method which used Epic’s Action RPG Demo for my game’s async loading screen. Most of the time it works without any issue but some times game crashes while loading. I checked out the logs and here is wh… --- ## [RenderThread Packaged only crash](https://forums.unrealengine.com/t/renderthread-packaged-only-crash/478204)
**Author:** [@r8ivy](https://forums.unrealengine.com/u/r8ivy)\ **Replies:** 0\ **Last updated:** [February 3, 2021, 5:18pm UTC](https://forums.unrealengine.com/t/renderthread-packaged-only-crash/478204 "2021-02-03T17:18:21Z")
this is in a packaged project made with the binary version of the engine (4.26.1) . I haven’t changed any rendering code ect. any help would be great. iv attached the log but i’m assuming this is the meat of the problem: … --- ## [Android Map Load Crashes](https://forums.unrealengine.com/t/android-map-load-crashes/477123)
**Author:** [@okanerenli](https://forums.unrealengine.com/u/okanerenli)\ **Replies:** 0\ **Last updated:** [January 15, 2021, 11:00am UTC](https://forums.unrealengine.com/t/android-map-load-crashes/477123 "2021-01-15T11:00:43Z")
My game was working good on android. I made some changes and now it’s crashes When there is some asset in the map. Main menu with no asset always works but. when I try to load any map it’s most of the time crashes with … --- ## [Error massage: \[SM5\] /Engine/Private/HitProxyVertexShader.usf(34,3-34): error X3000: unrecognized identifier 'FVertexFactoryInterpolantsVSToDS'](https://forums.unrealengine.com/t/error-massage-sm5-engine-private-hitproxyvertexshader-usf-34-3-34-error-x3000-unrecognized-identifier-fvertexfactoryinterpolantsvstods/476665)
**Author:** [@chosentwo](https://forums.unrealengine.com/u/chosentwo)\ **Replies:** 0\ **Last updated:** [January 2, 2021, 6:35am UTC](https://forums.unrealengine.com/t/error-massage-sm5-engine-private-hitproxyvertexshader-usf-34-3-34-error-x3000-unrecognized-identifier-fvertexfactoryinterpolantsvstods/476665 "2021-01-02T06:35:54Z")
hello guys, i get error when im compile the material, this error massage: \[SM5\] /Engine/Private/HitProxyVertexShader.usf(34,3-34): error X3000: unrecognized identifier ‘FVertexFactoryInterpolantsVSToDS’ did anyone hav… --- ## [Failed to route PostInitProperties](https://forums.unrealengine.com/t/failed-to-route-postinitproperties/465337)
**Author:** [@Nox\_A15](https://forums.unrealengine.com/u/Nox_A15)\ **Replies:** 13\ **Last updated:** [December 21, 2020, 6:55am UTC](https://forums.unrealengine.com/t/failed-to-route-postinitproperties/465337 "2020-12-21T06:55:32Z")
Hello, I recently moved my BP-only project to UE 4.25 and have a problem with opening the game on Android. It packages without problem but running it on my Android phone (OnePlus 3T) always ends up with a crash on start… --- ## [Gpu crashing critical error](https://forums.unrealengine.com/t/gpu-crashing-critical-error/475307)
**Author:** [@overbeck87](https://forums.unrealengine.com/u/overbeck87)\ **Replies:** 0\ **Last updated:** [December 2, 2020, 12:33pm UTC](https://forums.unrealengine.com/t/gpu-crashing-critical-error/475307 "2020-12-02T12:33:22Z")
HI I am getting this error when i bake a 4 storey house in UE4.25 I am using GPU lightmass there are only 1609 actors and 2163 unbuilt objects to be built. Any ideas how to fix this error? 09:47:24: LogWindows: Warni… [Next page](https://forums.unrealengine.com/tag/critical-error/10962.md?match_all_tags=true&page=1&tags%5B%5D=critical-error)