I unable to compile C++ project with the source version of UE 5.1

Development Platform & Builds
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1

Hello,

I have the UE 5.1 (not binary, but source), and I try to compile it with a project. I use Perforce. After having updated project to UE 5.1, I am unable to compile with the following errors:

26>D:\Perforce\MyPC\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(176,5): error MSB4018: The “GenerateDepsFile” task failed unexpectedly. [D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj]
26>D:\Perforce\MyPC\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(176,5): error MSB4018: System.IO.IOException: The process cannot access the file ‘D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\bin\Development\netcoreapp3.1\EpicGames.Core.deps.json’ because it is being used by another process. [D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj]
26>D:\Perforce\MyPC\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(176,5): error MSB4018: at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) [D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj]
26>D:\Perforce\MyPC\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(176,5): error MSB4018: at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost) [D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj]
26>D:\Perforce\MyPC\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(176,5): error MSB4018: at System.IO.FileStream…ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize) [D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj]
26>D:\Perforce\MyPC\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(176,5): error MSB4018: at System.IO.File.Create(String path, Int32 bufferSize) [D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj]
26>D:\Perforce\MyPC\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(176,5): error MSB4018: at Microsoft.NET.Build.Tasks.GenerateDepsFile.WriteDepsFile(String depsFilePath) [D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj]
26>D:\Perforce\MyPC\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(176,5): error MSB4018: at Microsoft.NET.Build.Tasks.GenerateDepsFile.ExecuteCore() [D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj]
26>D:\Perforce\MyPC\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(176,5): error MSB4018: at Microsoft.NET.Build.Tasks.TaskBase.Execute() [D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj]
26>D:\Perforce\MyPC\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(176,5): error MSB4018: at Microsoft.NET.Build.Tasks.TaskWithAssemblyResolveHooks.Execute() [D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj]
26>D:\Perforce\MyPC\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(176,5): error MSB4018: at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj]
26>D:\Perforce\MyPC\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets(176,5): error MSB4018: at Microsoft.Build.BackEnd.TaskBuilder.d__26.MoveNext() [D:\Perforce\MyPC\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj]

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1 Like
2

I get exactly this too. Did you find a solution to it?

3

Also getting the same problem. If you try rebuilding a couple times, it will eventually succeed. Annoying nonetheless

4

Hi there,

Did any of you find out what the issue is?

I am getting the same error, wondering if its about the .NET SDK and .NET Runtime versions

Error MSB4018 The "GenerateDepsFile" task failed unexpectedly. 
[C:\mlf\unreal-engine-source-5.1\UnrealEngine\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj] Unsync C:\mlf\unreal-engine-source-5.1\UnrealEngine\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets

Error MSB4018 System.IO.IOException: The process cannot access the file C:\mlf\unreal-engine-source-5.1\UnrealEngine\Engine\Source\Programs\Shared\EpicGames.Core\bin\Development\netcoreapp3.1\EpicGames.Core.deps.json because it is being used by another process. [C:\mlf\unreal-engine-source-5.1\UnrealEngine\Engine\Source\Programs\Shared\EpicGames.Core\EpicGames.Core.csproj] Unsync C:\mlf\unreal-engine-source-5.1\UnrealEngine\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\sdk\6.0.302\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.targets
5

In case this helps anyone, my project finally built successfully after doing these two things

  1. Generated the files specifically for VS 2022 by running GenerateProjectFiles.bat -2022

  2. Since I was creating a Dedicated Server for my project I also built both the Development Editor and Development Server by right clicking on the project in the Solution Explorer rather than using the toolbar ‘build’ menu
    image

6

Update your local repository from source and try again. Latest release fixed the problem. https://github.com/EpicGames/UnrealEngine/commit/5a761d5e44c535cdd6069bb99c786f02c7abe33b .