# \#compiling **URL:** https://forums.unrealengine.com/tag/compiling/65.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [Enviroment variable too long](https://forums.unrealengine.com/t/enviroment-variable-too-long/2690056)
**Author:** [@Reicon](https://forums.unrealengine.com/u/Reicon)\ **Replies:** 5\ **Last updated:** [September 7, 2026, 6:46pm UTC](https://forums.unrealengine.com/t/enviroment-variable-too-long/2690056 "2026-09-07T18:46:54Z")
I am compiling a c++ project with visual studio 2022 and I am getting an error (System.ArgumentException in System.Environment.SetEnvironmentVariable(String variable, String value) in System.Environment.SetEnvironmentVa… --- ## [UE5 GenerateProjectFiles.command fails to build UnrealBuildTool when compiling from source on MacOS. Throws "Failed to load JIT compiler" and "dotnet command failed with errorcode 134" ](https://forums.unrealengine.com/t/ue5-generateprojectfiles-command-fails-to-build-unrealbuildtool-when-compiling-from-source-on-macos-throws-failed-to-load-jit-compiler-and-dotnet-command-failed-with-errorcode-134/2747116)
**Author:** [@Poelaos](https://forums.unrealengine.com/u/Poelaos)\ **Replies:** 0\ **Last updated:** [August 28, 2026, 3:47pm UTC](https://forums.unrealengine.com/t/ue5-generateprojectfiles-command-fails-to-build-unrealbuildtool-when-compiling-from-source-on-macos-throws-failed-to-load-jit-compiler-and-dotnet-command-failed-with-errorcode-134/2747116 "2026-08-28T15:47:34Z")
Trying to set up Unreal Engine 5 on my MacBook so I can use UnrealPak.exe to open Unreal Engine .pak files. I’m compiling from source as instructed. I cloned from github using the command “git clone https://github.com/Ep… --- ## [What causes "excluded from unity build"?](https://forums.unrealengine.com/t/what-causes-excluded-from-unity-build/442332)
**Author:** [@byg\_ben](https://forums.unrealengine.com/u/byg_ben)\ **Replies:** 8\ **Last updated:** [June 23, 2026, 2:06am UTC](https://forums.unrealengine.com/t/what-causes-excluded-from-unity-build/442332 "2026-06-23T02:06:13Z")
I’m using wwise and I’ve noticed in the last few months, my compile times suddenly got a lot longer. Every time I compile, I get the following message: 2\>\[Adaptive unity build\] Disabling PCH for excluded files. Set bAd… --- ## [Global Shader compilation and bundled PSOs usage ](https://forums.unrealengine.com/t/global-shader-compilation-and-bundled-psos-usage/2728489)
**Author:** [@SkyKing\_PX\_Dev](https://forums.unrealengine.com/u/SkyKing_PX_Dev)\ **Replies:** 1\ **Last updated:** [June 14, 2026, 9:38pm UTC](https://forums.unrealengine.com/t/global-shader-compilation-and-bundled-psos-usage/2728489 "2026-06-14T21:38:42Z")
Hello, I have thought about the process of “compiling shaders” in games for quite some time now and in most games that were made with Unreal Engine, you can see a Screen/Widget for shader compilation (maybe even just tex… --- ## [On my machine, the project compiles without issue while other people in the repo cannot compile as they are met with "No such file or directory" errors.](https://forums.unrealengine.com/t/on-my-machine-the-project-compiles-without-issue-while-other-people-in-the-repo-cannot-compile-as-they-are-met-with-no-such-file-or-directory-errors/2720693)
**Author:** [@MartinianoMarelli](https://forums.unrealengine.com/u/MartinianoMarelli)\ **Replies:** 2\ **Last updated:** [May 9, 2026, 2:18am UTC](https://forums.unrealengine.com/t/on-my-machine-the-project-compiles-without-issue-while-other-people-in-the-repo-cannot-compile-as-they-are-met-with-no-such-file-or-directory-errors/2720693 "2026-05-09T02:18:55Z")
Recently I’ve worked on a project with a group of people, but currently after some commits the project will no longer compile in other machines. The error shows a series of header files that exist in the project, but … --- ## [Horde system user authentication (ServiceAccounts)](https://forums.unrealengine.com/t/horde-system-user-authentication-serviceaccounts/2676773)
**Author:** [@Jacobo-rpg](https://forums.unrealengine.com/u/Jacobo-rpg)\ **Replies:** 2\ **Last updated:** [February 27, 2026, 1:23pm UTC](https://forums.unrealengine.com/t/horde-system-user-authentication-serviceaccounts/2676773 "2026-02-27T13:23:43Z")
We are using Horde for distributed compilation for our developers and have configured Horde with Okta SSO. We would like to also allow our current CI system, which runs on TeamCity, to utilize Horde agents for compilati… --- ## [Waiting for 'git status' command to complete making for long compile times](https://forums.unrealengine.com/t/waiting-for-git-status-command-to-complete-making-for-long-compile-times/412358)
**Author:** [@Ryan\_Darcey](https://forums.unrealengine.com/u/Ryan_Darcey)\ **Replies:** 14\ **Last updated:** [October 28, 2025, 2:46pm UTC](https://forums.unrealengine.com/t/waiting-for-git-status-command-to-complete-making-for-long-compile-times/412358 "2025-10-28T14:46:33Z")
Just updated from 4.15 to 4.18.2 and compiling now has crazy long spin up time w/ suspicious ‘git status’ messages I don’t remember seeing earlier. Any ideas here? Used to blow right through these projects when the tar… --- ## [Development Only mark not working, still in shipping build](https://forums.unrealengine.com/t/development-only-mark-not-working-still-in-shipping-build/2626575)
**Author:** [@BOBtheROSS](https://forums.unrealengine.com/u/BOBtheROSS)\ **Replies:** 1\ **Last updated:** [October 13, 2025, 6:03pm UTC](https://forums.unrealengine.com/t/development-only-mark-not-working-still-in-shipping-build/2626575 "2025-10-13T18:03:55Z")
Won’t fix is the answer to this problem :frowning: original post: Hi everyone, Did anybody notice that the marking for “Development Only” in the context menu for nodes does not work? I tested it with a new function… --- ## [Plugin Errors in Mac Build \[RESOLVED\]](https://forums.unrealengine.com/t/plugin-errors-in-mac-build-resolved/472950)
**Author:** [@KindredGames](https://forums.unrealengine.com/u/KindredGames)\ **Replies:** 2\ **Last updated:** [August 26, 2025, 5:02am UTC](https://forums.unrealengine.com/t/plugin-errors-in-mac-build-resolved/472950 "2025-08-26T05:02:56Z")
Hey guys. We recently launched our game on Steam and are now trying to get a Mac build together, but we’ve been running into some errors. It seems like all the errors are due to missing nodes from plugins, yet all the … --- ## [Can't compile MetaHuman](https://forums.unrealengine.com/t/cant-compile-metahuman/1291654)
**Author:** [@SoulburnerSlv](https://forums.unrealengine.com/u/SoulburnerSlv)\ **Replies:** 41\ **Last updated:** [August 21, 2025, 11:15am UTC](https://forums.unrealengine.com/t/cant-compile-metahuman/1291654 "2025-08-21T11:15:29Z")
I’m new to UE (10+ years of Unity though) and I’m trying to compile a simple project where I put a metahuman. But I don’t have any luck. Missing object file C:\\Program Files\\Epic Games\\UE\_5.3\\Engine\\Plugins\\Marketplac… --- ## [State Tree Crashing Engine On Compilation](https://forums.unrealengine.com/t/state-tree-crashing-engine-on-compilation/2543529)
**Author:** [@Zapking9224](https://forums.unrealengine.com/u/Zapking9224)\ **Replies:** 2\ **Last updated:** [August 9, 2025, 7:10pm UTC](https://forums.unrealengine.com/t/state-tree-crashing-engine-on-compilation/2543529 "2025-08-09T19:10:09Z")
Hi, So I’m having an issue where I have a state tree and I want to see if the enemy’s (the context actor) distance to the player is between 700 and 1000. The condition works fine if I put in just one condition for if it… --- ## [Warning: RebindPackages not possible (no packages specified)](https://forums.unrealengine.com/t/warning-rebindpackages-not-possible-no-packages-specified/427283)
**Author:** [@Nestoro](https://forums.unrealengine.com/u/Nestoro)\ **Replies:** 11\ **Last updated:** [June 21, 2025, 4:14pm UTC](https://forums.unrealengine.com/t/warning-rebindpackages-not-possible-no-packages-specified/427283 "2025-06-21T16:14:35Z")
Hey, when i hit compile UE does nothing but send me this message: Warning: RebindPackages not possible (no packages specified) also my C++ Classes folder is not displayed in the Content Browser. I opened a new projec… --- ## [Handled error Ensure condition failed InvocationList\[ CurFunctionIndex \] != InDelegate](https://forums.unrealengine.com/t/handled-error-ensure-condition-failed-invocationlist-curfunctionindex-indelegate/363872)
**Author:** [@Bolobolo](https://forums.unrealengine.com/u/Bolobolo)\ **Replies:** 9\ **Last updated:** [May 30, 2025, 11:03am UTC](https://forums.unrealengine.com/t/handled-error-ensure-condition-failed-invocationlist-curfunctionindex-indelegate/363872 "2025-05-30T11:03:24Z")
The project I’m working on used to compile in less than 6s, now it takes around 100s eventhough the code base is about the same size. Hotreload takes a lot longer than usual, and memory usage goes way up when Holtreload… --- ## [Why do I need Visual Studio 2022 x64 to compile my project](https://forums.unrealengine.com/t/why-do-i-need-visual-studio-2022-x64-to-compile-my-project/1844045)
**Author:** [@Zoltan333](https://forums.unrealengine.com/u/Zoltan333)\ **Replies:** 8\ **Last updated:** [May 29, 2025, 10:23pm UTC](https://forums.unrealengine.com/t/why-do-i-need-visual-studio-2022-x64-to-compile-my-project/1844045 "2025-05-29T22:23:18Z")
I get an error when I try to compile my project to windows. UATHelper: Packaging (Windows): No Visual C++ installation was found. Please download and install Visual Studio 2022 with C++ components. UATHelper: Packaging… --- ## [Why do shaders recompile constantly with any change to the material?](https://forums.unrealengine.com/t/why-do-shaders-recompile-constantly-with-any-change-to-the-material/277929)
**Author:** [@anonymous\_user\_6d364357](https://forums.unrealengine.com/u/anonymous_user_6d364357)\ **Replies:** 34\ **Last updated:** [May 26, 2025, 6:00pm UTC](https://forums.unrealengine.com/t/why-do-shaders-recompile-constantly-with-any-change-to-the-material/277929 "2025-05-26T18:00:28Z")
Whenever I make a change to a material (or even material instance!), 100-300 Shaders are recompiling in the background, showing the updated material afterwards. I have noticed that In the material editors my previews do… --- ## [Cannot package mid-sized UE5 game due to shader compile time exceeded threshold ](https://forums.unrealengine.com/t/cannot-package-mid-sized-ue5-game-due-to-shader-compile-time-exceeded-threshold/2506954)
**Author:** [@MrLowFps123](https://forums.unrealengine.com/u/MrLowFps123)\ **Replies:** 7\ **Last updated:** [May 14, 2025, 12:00am UTC](https://forums.unrealengine.com/t/cannot-package-mid-sized-ue5-game-due-to-shader-compile-time-exceeded-threshold/2506954 "2025-05-14T00:00:54Z")
This is a mid sized UE5 game, and when I try to package to windows I get a huge list of shader compliation time outs. Please help as I cannot package the game, even after leaving it overnight. Example: Log: message… --- ## [Power IK support for UE 4.16 - 4.21](https://forums.unrealengine.com/t/power-ik-support-for-ue-4-16-4-21/2442705)
**Author:** [@Efim\_Nabokih](https://forums.unrealengine.com/u/Efim_Nabokih)\ **Replies:** 0\ **Last updated:** [April 6, 2025, 6:02am UTC](https://forums.unrealengine.com/t/power-ik-support-for-ue-4-16-4-21/2442705 "2025-04-06T06:02:40Z")
Hello everyone. In my project, I created a good combat system based on the Power IK plugin, but I strongly dislike the way the graphics look in UE4, starting with version 4.22, and I would like to stay on engine versions… --- ## [Hot Reload problem - LINK : fatal error LNK1104: cannot open file Game-DebugGame.dll](https://forums.unrealengine.com/t/hot-reload-problem-link-fatal-error-lnk1104-cannot-open-file-game-debuggame-dll/441355)
**Author:** [@Bionic\_Ape](https://forums.unrealengine.com/u/Bionic_Ape)\ **Replies:** 9\ **Last updated:** [February 17, 2025, 6:15am UTC](https://forums.unrealengine.com/t/hot-reload-problem-link-fatal-error-lnk1104-cannot-open-file-game-debuggame-dll/441355 "2025-02-17T06:15:52Z")
Hi, I can’t hot reload my Project. The error that I get is fatal error LNK1104: cannot open file 'C:\\ProjectPath\\Binaries\\Win64\\UE4Editor-MyGame-Win64-DebugGame.dll'. It’s only happening when I use the solution configu… --- ## [Changing Maps with structres gives a lot of build errors. UE 5.5.2](https://forums.unrealengine.com/t/changing-maps-with-structres-gives-a-lot-of-build-errors-ue-5-5-2/2311908)
**Author:** [@vyzor](https://forums.unrealengine.com/u/vyzor)\ **Replies:** 0\ **Last updated:** [January 31, 2025, 3:14pm UTC](https://forums.unrealengine.com/t/changing-maps-with-structres-gives-a-lot-of-build-errors-ue-5-5-2/2311908 "2025-01-31T15:14:53Z")
Summary Changing any map with structs gives a cascade of errors you can rename to fix, but if the project is large, it can give unfix-able errors Please select what you are reporting on: Creative What Type of Bug are … --- ## [SetEnv Error when compiling source code from 4.25.0-release](https://forums.unrealengine.com/t/setenv-error-when-compiling-source-code-from-4-25-0-release/2291582)
**Author:** [@Clixxzy](https://forums.unrealengine.com/u/Clixxzy)\ **Replies:** 1\ **Last updated:** [January 20, 2025, 5:43am UTC](https://forums.unrealengine.com/t/setenv-error-when-compiling-source-code-from-4-25-0-release/2291582 "2025-01-20T05:43:53Z")
I’m trying to compile a specific commit from the unreal engine github. I’ve also tried compiling versions close to the one i need, yet nothing helps. I have a project for this version, and i don’t want to lose it. Help … --- ## [Error 'The project could not be compiled. Would you like to open it in Visual Studio?'](https://forums.unrealengine.com/t/error-the-project-could-not-be-compiled-would-you-like-to-open-it-in-visual-studio/1720405)
**Author:** [@yoojfromseoul](https://forums.unrealengine.com/u/yoojfromseoul)\ **Replies:** 14\ **Last updated:** [January 15, 2025, 5:03pm UTC](https://forums.unrealengine.com/t/error-the-project-could-not-be-compiled-would-you-like-to-open-it-in-visual-studio/1720405 "2025-01-15T17:03:34Z")
Hi there, I’ve been used just Blueprint in Unreal for a while. Today I tried to switch my Unreal proejct with C++ Scripts, so I prepared and set all of features or workload in Visual Studio Installer. After that work, … --- ## [\[Crash\] SIGSEV: Invalid attempt to access memory at address 0x3](https://forums.unrealengine.com/t/crash-sigsev-invalid-attempt-to-access-memory-at-address-0x3/474664)
**Author:** [@anonymous\_user\_0e275e7c](https://forums.unrealengine.com/u/anonymous_user_0e275e7c)\ **Replies:** 3\ **Last updated:** [December 10, 2024, 1:40pm UTC](https://forums.unrealengine.com/t/crash-sigsev-invalid-attempt-to-access-memory-at-address-0x3/474664 "2024-12-10T13:40:40Z")
Hello, I’m currently using a MacBook Pro version 10.14.6, 2.4 GHz Intel Core i5 with 8GB of memory. I’m using 4.25.4. I have my project on an external hard drive with Unreal Engine 4 running on my internal SDD. Previous… --- ## [AutomationTool exiting with ExitCode=25 (Error\_UnknownCookFailure)](https://forums.unrealengine.com/t/automationtool-exiting-with-exitcode-25-error-unknowncookfailure/2133382)
**Author:** [@NGRech](https://forums.unrealengine.com/u/NGRech)\ **Replies:** 1\ **Last updated:** [November 18, 2024, 9:21pm UTC](https://forums.unrealengine.com/t/automationtool-exiting-with-exitcode-25-error-unknowncookfailure/2133382 "2024-11-18T21:21:58Z")
Hello. I’ve been trying to compile a project for a job (my first job requiring this or any intermediate to advanced blueprint coding. I’m a level designer and 3D modeler) and I’m getting this error: COMPILE\_TEST.log (25… --- ## [Levels load sluggishly after compiling](https://forums.unrealengine.com/t/levels-load-sluggishly-after-compiling/2101445)
**Author:** [@V\_vix](https://forums.unrealengine.com/u/V_vix)\ **Replies:** 4\ **Last updated:** [November 3, 2024, 9:46am UTC](https://forums.unrealengine.com/t/levels-load-sluggishly-after-compiling/2101445 "2024-11-03T09:46:27Z")
When I load a level in editor, it loads almost instantly, but doing the same in a compiled project takes few seconds, where all the meshes in the level will pop into existence one by one. This would not be a problem, if… --- ## [2 duplicate symbols for architecture arm64](https://forums.unrealengine.com/t/2-duplicate-symbols-for-architecture-arm64/2034186)
**Author:** [@HarmanSingh999](https://forums.unrealengine.com/u/HarmanSingh999)\ **Replies:** 0\ **Last updated:** [September 23, 2024, 2:33pm UTC](https://forums.unrealengine.com/t/2-duplicate-symbols-for-architecture-arm64/2034186 "2024-09-23T14:33:24Z")
Hello everyone, Below mentioned error is occurring when I’m trying to package as IOS build. I’m using Unreal 4.27(Working on a premade game, they also used MSSR Plugin) and xcode 15.0.1 Before this I have solved variou… --- ## [Get compile\_commands.json](https://forums.unrealengine.com/t/get-compile-commands-json/433389)
**Author:** [@anonymous\_user\_5be014f9](https://forums.unrealengine.com/u/anonymous_user_5be014f9)\ **Replies:** 19\ **Last updated:** [September 20, 2024, 7:31pm UTC](https://forums.unrealengine.com/t/get-compile-commands-json/433389 "2024-09-20T19:31:41Z")
Hey, i am using rdm (with emacs) for my game development. rdm requires a compile\_commands.json file which is a file that contains all the the compile commands for the code. I am trying to create one for my game code and… --- ## [Compiling all blueprints on PIE](https://forums.unrealengine.com/t/compiling-all-blueprints-on-pie/428098)
**Author:** [@kiliki](https://forums.unrealengine.com/u/kiliki)\ **Replies:** 2\ **Last updated:** [August 4, 2024, 11:48pm UTC](https://forums.unrealengine.com/t/compiling-all-blueprints-on-pie/428098 "2024-08-04T23:48:28Z")
I’ve recently run into several bugs that have been fixed by manually recompiling every blueprint in my project. Having looked into it, the Play in Editor settings have a “recompile all blueprints” option, which is ticked… --- ## [Returning an interface from C++?](https://forums.unrealengine.com/t/returning-an-interface-from-c/332605)
**Author:** [@MichaelWion](https://forums.unrealengine.com/u/MichaelWion)\ **Replies:** 4\ **Last updated:** [July 31, 2024, 3:55pm UTC](https://forums.unrealengine.com/t/returning-an-interface-from-c/332605 "2024-07-31T15:55:40Z")
In my current project, I’m converting some blueprints into C++. One of these blueprints is able to search through all actors within the current scene, and return the interface for the first valid object which utilizes s… --- ## [Generate Visual Studio Project option missing](https://forums.unrealengine.com/t/generate-visual-studio-project-option-missing/366072)
**Author:** [@anonymous\_user\_87fc334a](https://forums.unrealengine.com/u/anonymous_user_87fc334a)\ **Replies:** 6\ **Last updated:** [July 30, 2024, 8:54am UTC](https://forums.unrealengine.com/t/generate-visual-studio-project-option-missing/366072 "2024-07-30T08:54:17Z")
After installing Visual Studio 2015 with Update 3 and Unreal 4.12.5 on a new computer with Windows 10, I’m unable to see the Generate Visual Studio Project option when right clicking on a .uproject file. I’ve tried crea… --- ## [Relaunching the editor after compiling with live coding seems to not save the changes.](https://forums.unrealengine.com/t/relaunching-the-editor-after-compiling-with-live-coding-seems-to-not-save-the-changes/1220269)
**Author:** [@lidorbuba](https://forums.unrealengine.com/u/lidorbuba)\ **Replies:** 3\ **Last updated:** [July 18, 2024, 3:00pm UTC](https://forums.unrealengine.com/t/relaunching-the-editor-after-compiling-with-live-coding-seems-to-not-save-the-changes/1220269 "2024-07-18T15:00:01Z")
I have recently started using C++ after becoming comfortable with blueprints. In order to compile quickly and easily, I have been using Live Coding. However, I have noticed that when I make changes using Live Coding and … [Next page](https://forums.unrealengine.com/tag/compiling/65.md?match_all_tags=true&page=1&tags%5B%5D=compiling)