I can't build the project due to error MSB3101 | Unreal Source | Page 1

sly seal Sep 12, 2025, 9:51 AM

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https://learn.microsoft.com/en-us/visualstudio/msbuild/errors/msb3101?view=vs-2022&f1url=%3FappId%3DDev17IDEF1%26l%3DEN-US%26k%3Dk(MSBuild.Exec.CommandFailed)%26rd%3Dtrue This is what the link sent me but I do not know how to apply the suggested solutions.

MSB3101 diagnostic code - MSBuild

Learn about the possible causes of the MSB3101 build error and get troubleshooting tips.

sullen vale Sep 12, 2025, 9:54 AM

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Not sure why this was started as a thread, but you need to share precise error messages

sly seal Sep 12, 2025, 9:56 AM

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Just making a thread to avoid clutter

sullen vale Sep 12, 2025, 9:58 AM

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Stop using the useless error list and look at the output tab

sly seal Sep 12, 2025, 10:05 AM

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C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v170\Microsoft.MakeFile.Targets(44,5): error MSB3073: The command ""C:\Program Files\Epic Games\UE_5.5\Engine\Build\BatchFiles\Build.bat" ProjectEldarionEditor Win64 Development -Project="C:\Users\USER\ProjectEldarion_2\ProjectName.uproject" -WaitMutex -FromMsBuild -architecture=x64" exited with code 8.

12>C:\Users\USER\PROJECT\Source\Project\ProjectName.Build.cs : warning : Referenced directory 'C:\Users\USER\Project\Source\ProjectName\Niagara' does not exist.

Those are the main culprits.

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I'll look around for answers but thanks for a much-needed kick in the butt.

sullen vale Sep 12, 2025, 10:09 AM

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This looks like only part of it

sly seal Sep 12, 2025, 10:09 AM

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I think I found a thread that might have the answers I need

stable venture Sep 12, 2025, 10:29 AM

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sly seal C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Microsoft\VC\v17...

paste entire log panel output

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as for folder warning - show your build.cs, why are you referencing that folder. it won't be a stopper

sly seal Sep 12, 2025, 10:33 AM

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I set "plugins" to false and back tot rue and now the .sln can't find the project.

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Crap.

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C:\Users\USER\ProjectName\Intermediate\ProjectFiles\UE5.vcxproj : error : The project file could not be loaded. Could not find a part of the path 'C:\Users\USER\ProjectName\Intermediate\ProjectFiles\UE5.vcxproj'. C:\Users\USER\ProjectName\Intermediate\ProjectFiles\UE5.vcxproj

C:\Users\USER\ProjectName\Intermediate\ProjectFiles\ProjectName.vcxproj : error : The project file could not be loaded. Could not find a part of the path 'C:\Users\USER\ProjectName\Intermediate\ProjectFiles\ProjectName.vcxproj'. C:\Users\USER\ProjectName\Intermediate\ProjectFiles\ProjectName.vcxproj

C:\Users\USER\ProjectName\Intermediate\Build\BuildRulesProjects\ProjectNameModuleRules\ProjectNameModuleRules.csproj : error : The project file could not be loaded. Could not find a part of the path 'C:\Users\USER\ProjectName\Intermediate\Build\BuildRulesProjects\ProjectNameModuleRules\ProjectNameModuleRules.csproj'. C:\Users\USER\ProjectName\Intermediate\Build\BuildRulesProjects\ProjectNameModuleRules\ProjectNameModuleRules.csproj

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I was usingthis thred that told me to delete Intemrediate folder https://forums.unrealengine.com/t/msb3073-exited-with-code-8/1901997/6

Epic Developer Community Forums

MSB3073 exited with code 8

So I was dealing with this for a few days, and deleted all the temp files and regenerated which didnt work for me. So after reading endless reddit and forums, I saw someone mention that in the .uproject file (plugins specifically) may be causing the issues. I opened my .uproject file and compared to an older backup I had saved where I saw a few ...

stable venture Sep 12, 2025, 10:37 AM

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close visual studio

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right click on uproject - generate project files

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open the sln

#I can't build the project due to error MSB3101