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Generating dll while UE4 editor is opened.

I noticed, that in 4.15 I cannot build c++ code while editor is opened. I had not such problem with 4.14. If I close the editor, it goes thru just fine.

Here is the error:

 2>     Creating library C:\GameArtists\Unreal\GameSavePro\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-GameSavePro-1478.lib and object C:\GameArtists\Unreal\GameSavePro\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-GameSavePro-1478.exp
 2>     Creating library C:\GameArtists\Unreal\GameSavePro\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-GameSavePro-1478.suppressed.lib and object C:\GameArtists\Unreal\GameSavePro\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-GameSavePro-1478.suppressed.exp
 2>ERROR : UBT error : Failed to produce item: C:\GameArtists\Unreal\GameSavePro\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-GameSavePro-4536.lib
 2>  Total build time: 3.89 seconds (Local executor: 0.00 seconds)
 2>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.MakeFile.Targets(41,5): error MSB3075: The command ""C:\Program Files (x86)\Epic Games\4.15\Engine\Build\BatchFiles\Build.bat" GameSaveProEditor Win64 Development "C:\GameArtists\Unreal\GameSavePro\GameSavePro.uproject" -waitmutex" exited with code 5. Please verify that you have sufficient rights to run this command.
 ========== Build: 1 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Product Version: UE 4.15 Preview
Tags:
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asked Feb 10 '17 at 03:34 PM in Bug Reports

Flash7 gravatar image

Flash7
96 3 3 9

Tim Lincoln gravatar image Tim Lincoln ♦♦ STAFF Feb 15 '17 at 10:41 PM

Hi Flash7,

I just tried to recreate this issue in a new 4.15 project, and didn't have any trouble doing a hot reload. Would you be able to provide some additional information?

  • Are you using the binary version of the Engine installed through the Launcher, or did you build the Engine from source code?

  • What version of Visual Studio are you using?

  • What changes to your code are you making?

  • How are you starting the build process?

Tim

Flash7 gravatar image Flash7 Feb 15 '17 at 11:01 PM

Are you using the binary version of the Engine installed through the Launcher, or did you build the Engine from source code?

I run the Editor via Launcher

What version of Visual Studio are you using?

VS 2015 (update 3)

What changes to your code are you making?

I have a blueprint library. Every time I change a source code (.h and .cpp) and recompile, I have this problem.

How are you starting the build process?

In Visual Studio - build solution (F7) If I close the editor, build goes thru just fine and I see in output: 2> Deleting old hot reload file: "C:\GameArtists\Unreal\GameSavePro\Binaries\Win64\UE4Editor-GameSavePro-7218.dll". 2> Deleting old hot reload file: "C:\GameArtists\Unreal\GameSavePro\Binaries\Win64\UE4Editor-GameSavePro-7218.pdb".
Tim Lincoln gravatar image Tim Lincoln ♦♦ STAFF Feb 16 '17 at 05:02 PM

Do you get the same result if you right-click on the project in Visual Studio's Solution Explorer and select the Build option?

Tim

nrobinson gravatar image nrobinson Feb 16 '17 at 05:15 PM

Wierdly the first time I did a right click on the project build I got hundreds of duplicate function linker errors, but since then I'm getting the same behaviour as using F7/Ctrl+Shift+B

Flash7 gravatar image Flash7 Feb 16 '17 at 05:38 PM

Tim, yes, there is the same error if I select Build from solution explorer.

nrobinson gravatar image nrobinson Feb 16 '17 at 05:56 PM

Hi Tim,

I'm not at all certain, but I think it may be related to building plugins. We have a code plugin in the game directory rather than installed into the engine. The VS built hot-reload dll for the game has a dependency on a hot-reload dll for the plugin, however the plugin hot-reload dll hasn't been output by the build process, although a lib and exp have. When building through the editor the game hot-reload dll has a dependency on the base plugin dll instead.

i.e. VS: game-437-win.dll -> plugin-437-win.dll (missing) Editor: game-437-win.dll -> plugin-win.dll

Cheers,

Nick

Tim Lincoln gravatar image Tim Lincoln ♦♦ STAFF Feb 17 '17 at 04:15 PM

Thank you for the clarification everyone. Using a project that contained a plugin, I was able to see the error message that was described. I am curious to know if the hot reload is actually failing for you, though. In my case, Visual Studio was reporting the build failed with that error message, but in the Editor the changes were available (only changes to project code, plugins currently do not get hot reloaded).

Tim

Flash7 gravatar image Flash7 Feb 17 '17 at 04:58 PM

Tim, I tried to replicate it on different c++ projects (no plug-ins), and I see that the same error on each of them if an editor is opened. Just for clarification, it worked well in 4.12-4.14. This type of error showed up only in 4.15

nrobinson gravatar image nrobinson Feb 17 '17 at 05:09 PM

Unfortunately that's not the case for me, the code changes (in the primary game dll) aren't going through to the editor.

Tim Lincoln gravatar image Tim Lincoln ♦♦ STAFF Feb 17 '17 at 09:13 PM

That's unfortunate, I thought I had managed to reproduce what you were seeing. I will have to look into this further next week. Would it be at all possible to get a sample project that I could compare with my setup to see where I am doing things differently?

Tim

nrobinson gravatar image nrobinson Feb 16 '17 at 04:33 PM

We're having similar issues, hot-reload is working correctly if we use the compile button in the editor, however building through visual studio successfully creates a DLL but the editor the fails to load it, which disables hot-reloading causing later hot-reload builds to fail to link in VS and the compile button to disappear. This is consistent across our team so it's not specific to one machine although we all probably have a similar setup.

Win10, VS2015 Update3

VS and editor output below:

[3/4] Link UE4Editor-MyGame-27-Win64-DebugGame.dll 2> [4/4] Link UE4Editor-MyGame-27-Win64-DebugGame.lib 2> Creating library E:\dev\MyGame\Game\Intermediate\Build\Win64\UE4Editor\DebugGame\UE4Editor-MyGame-27-Win64-DebugGame.lib and object E:\dev\MyGame\Game\Intermediate\Build\Win64\UE4Editor\DebugGame\UE4Editor-MyGame-27-Win64-DebugGame.exp 2> Creating library E:\dev\MyGame\Game\Intermediate\Build\Win64\UE4Editor\DebugGame\UE4Editor-MyGame-27-Win64-DebugGame.suppressed.lib and object E:\dev\MyGame\Game\Intermediate\Build\Win64\UE4Editor\DebugGame\UE4Editor-MyGame-27-Win64-DebugGame.suppressed.exp 2> Deploying MyGameEditor Win64 DebugGame... 2> Total build time: 14.43 seconds (Local executor: 5.37 seconds)

LogHotReload: New module detected: UE4Editor-MyGame-27-Win64-DebugGame.dll LogHotReload: Starting Hot-Reload from IDE LogSlate: Took 0.000244 seconds to synchronously load lazily loaded font '../../../Engine/Content/Slate/Fonts/Roboto-Light.ttf' (159K) LogModuleManager:Warning: ModuleManager: Unable to load module 'E:/dev/MyGame/Game/Binaries/Win64/UE4Editor-MyGame-27-Win64-DebugGame.dll' because the file couldn't be loaded by the OS. Warning: HotReload failed, reload failed /Script/MyGame. LogContentBrowser: Native class hierarchy populated in 0.0141 seconds. Added 2327 classes and 487 folders. Display: HotReload took 0.1s.

j_zeitler gravatar image j_zeitler Mar 02 '17 at 01:45 PM

I'm also having this problem now. Started with OPs problem (hot reloading *.dll works but *.lib does not) but now the editor doesn't seem to load the *.ddl either:

 LogModuleManager:Warning: ModuleManager: Unable to load module 'C:/z/myproj/Binaries/Win64/UE4Editor-myproj-4414.dll' because the file couldn't be loaded by the OS.
 Warning: HotReload failed, reload failed /Script/myproj.

Edit: Creating a new 4.15 project still does not have this more "critical" version of the problem.

Akihiro.Kayama gravatar image Akihiro.Kayama Feb 15 '17 at 11:56 PM

I experienced same problem with EGL 4.15.0 Preview 4/Visual Studio 2015 Update2/some modification added ThirdPerson project. DLL was successfully produced without error log but UBT reported fail. After deleting Intermediate/ directory, the symptom had gone away and I can't reproduce it.

Akihiro.Kayama gravatar image Akihiro.Kayama Feb 18 '17 at 02:52 AM

Here is a reproducible step I found with EGL 4.15.0.

  • Launch EGL 4.15.0 from EGL

  • Create a new C++ ThirdPerson project (named tps16)

  • edit and save tps16.cpp (no actual modification needed)

  • Build with VS2015 (and hot reload DLL is generated successfully)

  • Finish UE4Editor.exe (with its window close button)

  • execute UE4Editor.exe(with double click on tps16.uproject)

  • edit and save tps16.cpp (no actual modification needed)

  • Build with VS2015(Ctrl+Shift+B)

  • and then DLL is generated successfully but UBT reports failed

 2>Build:
 2>         Compiling game modules for hot reload
 2>         [1/3] Compile tps16.cpp
 2>         tps16.cpp
 2>         [2/3] Link UE4Editor-tps16-8715.dll
 2>         [3/3] Link UE4Editor-tps16-6471.lib
 2>            ????????? C:\proj2\ue415sample\tps16\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-tps16-8715.lib ??????????? C:\proj2\ue415sample\tps16\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-tps16-8715.exp ?????
 2>            ????????? C:\proj2\ue415sample\tps16\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-tps16-8715.suppressed.lib ???????????? C:\proj2\ue415sample\tps16\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-tps16-8715.suppressed.exp ??????
 2>         -------- End Detailed Actions Stats -----------------------------------------------------------
 2>     1>
 2>ERROR : UBT error : Failed to produce item: C:\proj2\ue415sample\tps16\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-tps16-6471.lib

Don't care "???" which is because UBT can't handle Japanese character. These lines means success. I noticed .lib are numbered wrongly in log. Actual generated .lib is UE4Editor-tps16-8715.lib.

I think this is related to https://issues.unrealengine.com/issue/UE-42041 (hot reload DLL is wrongly loaded when editor launched, without rebuild)

Tim Lincoln gravatar image Tim Lincoln ♦♦ STAFF Feb 20 '17 at 10:53 PM

Hi Akihiro.Kayama,

Thank you for this repro case. I was able to use it to easily reproduce the issue without needing to use a plugin. I want to check a couple more things tomorrow, including upgrading projects to 4.15, but I think this is the issue that most people are seeing.

Tim

mpxc gravatar image mpxc Feb 20 '17 at 04:35 AM

I've also been getting the same error whenever doing runtime compiling from Visual Studio after upgrading from 4.14.3 to 4.15.0. Doing any modification to a .cpp or .h file and building while the editor is open causes the error, but if the editor is closed there is no problem.

I'm not using any editor plugins and haven't made any changes to the project or tried any new features since upgrading to 4.15.0.

 1>------ Build started: Project: UE4, Configuration: BuiltWithUnrealBuildTool Win32 ------
 2>------ Build started: Project: Project, Configuration: Development_Editor x64 ------
 2>  Compiling game modules for hot reload
 2>  Performing 3 actions (4 in parallel)
 2>  ProjectComponent.cpp
 2>  [2/3] Link UE4Editor-Project-8362.dll
 2>  [3/3] Link UE4Editor-Project-3008.lib
 2>     Creating library D:\UnrealProjects\Project\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-Project-8362.lib and object D:\UnrealProjects\Project\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-Project-8362.exp
 2>     Creating library D:\UnrealProjects\Project\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-Project-8362.suppressed.lib and object D:\UnrealProjects\Project\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-Project-8362.suppressed.exp
 2>ERROR : UBT error : Failed to produce item: D:\UnrealProjects\Project\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-Project-3008.lib
 2>  Total build time: 14.57 seconds (Local executor: 0.00 seconds)
 2>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.MakeFile.Targets(37,5): error MSB3075: The command ""C:\Program Files\Epic Games\UE_4.15\Engine\Build\BatchFiles\Build.bat" ProjectEditor Win64 Development "D:\UnrealProjects\Project\Project.uproject" -waitmutex" exited with code 5. Please verify that you have sufficient rights to run this command.
 ========== Build: 1 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

mpxc gravatar image mpxc Feb 20 '17 at 06:55 AM

Weirdly enough, the hot reload seems to be succeeding and reflecting the changes despite the error...

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1 answer: sort voted first

Hello everyone,

Thank you for the information that you have provided for this issue. I was able to reproduce the issue that I believe the majority of you are seeing, and reported it in UE-42205 for further investigation. If you are seeing different results from what I reported in that ticket, please continue to provide any additional information you may have specific to your results and I will keep trying to reproduce those results.

Tim

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answered Feb 21 '17 at 04:06 PM

Tim Lincoln gravatar image

Tim Lincoln ♦♦ STAFF
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eudrea gravatar image eudrea Feb 23 '17 at 12:58 PM

The workaround suggested doesn't always work (for example in our case, it doesn't work once). That's the error we're getting. I've reproduced the steps you specify in the Bug description on how to workaround it. "ERROR : UBT error : Failed to produce item: D:\Lucru\Cube\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-Cube-7736.lib"

One strange thing which I don't think I've seen before is the linking to 2 different file names (the lib is not the same as the dll).

 > 1>  Compiling game modules for hot
 > reload 1>  Performing 4 actions (4 in
 > parallel) 1>  EnemySpawner.cpp 1> 
 > TankStage3BossComponent.cpp 1>  [3/4]
 > Link UE4Editor-Cube-7449.dll 1>  [4/4]
 > Link UE4Editor-Cube-7736.lib


bstone gravatar image bstone Feb 28 '17 at 06:59 AM

Yes, UBT in 4.15 loses track of the build numbers and for some reason it expects the wrong build number for the .lib file while in fact they match that of the .dll.

Xetatronics gravatar image Xetatronics Feb 26 '17 at 07:01 PM

I have exacly the same problem since I updated to 4.15. It worked just fine in 4.14. Deleting the Intermediate folder and generating project files worked until i started the editor, closed it and opened it again afterwards. Now again, i can't build my project...

orieporter gravatar image orieporter Feb 26 '17 at 07:12 PM

I have the same error. Also if I build in the editor I get no errors but blueprints are not reflecting changes made in code. This is for a project that was upgraded from 4.14 to 4.15.

Dustums gravatar image Dustums Mar 01 '17 at 05:20 PM

I tried the work around in UE-42205 and it worked for a single compile but then failed on the second try

 2>  Compiling game modules for hot reload
 2>  Performing 4 actions (4 in parallel)
 2>  [2/4] Link UE4Editor-RuntimeMeshComponent-2318.lib
 2>     Creating library E:\Projects\Unreal\Pegs 4.15\Plugins\UE4RuntimeMeshComponent-2.0\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-RuntimeMeshComponent-2318.lib and object E:\Projects\Unreal\Pegs 4.15\Plugins\UE4RuntimeMeshComponent-2.0\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-RuntimeMeshComponent-2318.exp
 2>  PegsPlayerCharacter.cpp
 2>  [3/4] Link UE4Editor-Pegs-9255.dll
 2>  [4/4] Link UE4Editor-Pegs-6902.lib
 2>     Creating library E:\Projects\Unreal\Pegs 4.15\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-Pegs-9255.lib and object E:\Projects\Unreal\Pegs 4.15\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-Pegs-9255.exp
 2>     Creating library E:\Projects\Unreal\Pegs 4.15\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-Pegs-9255.suppressed.lib and object E:\Projects\Unreal\Pegs 4.15\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-Pegs-9255.suppressed.exp
 2>ERROR : UBT error : Failed to produce item: E:\Projects\Unreal\Pegs 4.15\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-Pegs-6902.lib

I am using a plug in RuntimeMeshComponent. I checked and my code changes aren't making it into the editor, so it is not just a reporting issue. The hot load did indeed fail. If I close the editor I can build just fine.

Tim Lincoln gravatar image Tim Lincoln ♦♦ STAFF Mar 02 '17 at 06:57 PM

The issue here appears to be triggered by any hot reload performed on a project. The first hot reload seems to work fine, but any hot reloads that are performed after that (the Editor does not actually need to be closed in between hot reloads, I found) will display this result. We have some engineers looking into this, and will hopefully have it resolved soon.

Tim

Tim Lincoln gravatar image Tim Lincoln ♦♦ STAFF Mar 06 '17 at 11:00 PM

Hello everyone,

I just wanted to provide a quick update on this issue. We have a fix in place for this issue, and it is expected to be included in the first hotfix for 4.15. If you continue to see this occurring in 4.15.1, please let us know.

Tim

nrobinson gravatar image nrobinson 3 days ago

Hi Tim,

We're still seeing the same issue in 4.15.1, no change to repro steps or result.

I don't believe this is the same as you're seeing in UE-42205. As previously mentioned the editor is not reporting a successful hot reload but that the OS can't load the produced dll.

Nick

Xetatronics gravatar image Xetatronics Mar 11 '17 at 12:25 AM

Thanks a lot guys! Once the Hotfix is out i will try that out and come back to you in case the problem still exists!

Dustums gravatar image Dustums 4 days ago

Build 4.15.1 made my compile error go away, but the hot reload does not take effect. I have to close the editor and reopen it to see my code changes in editor. This is a soul-crushing hit to my workflow iterations.

I believe this is related to me using a plugin (namely UE4RuntimeMeshComponent-2.0), though hot reload worked fine in 4.14.

Kanibel gravatar image Kanibel yesterday

Just like some of the comments above, 4.15.1 fixed the visual studio error, but we are still getting the hot reload failed in editor.

Using VS17 on Windows 10 and only have one plugin in the projects folder (FMOD Audio)

wjakobczyk gravatar image wjakobczyk yesterday

I'm having the same issue - hot reload failed in editor.

In addition, when I just restart the editor then on startup I get "The game module 'X' could not be loaded. There may be an operating system error or the module may not be properly set up. Another build in VS resolves that and the editor starts. Fails on next hot reload of course.

I tried removing Intermediate and regenerating VS project files - did not help.

The project is using a plugin and references it in the C++ code. I can't move the code in, as it's a 3rd party plugin. Hope the issue will be resolved soon as it has huge impact on productivity...

wjakobczyk gravatar image wjakobczyk yesterday

Until it's fixed, is there a way to disable hot reloading on new build in VS but still be able to hot reload when built in Editor? Then I could build in VS to fix compilation errors and do additional build in Editor when ready for testing. Now a VS build forces restart of Editor.

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