Hello everyone,
I am receiving the following error on when trying to build a fresh game with UE5 using Rider. I was receiving the same error when using VS2019 with UE4.26. I have done some research online regarding the error and what others that used to troubleshoot, but I am still at a loss to determine how to fix the error.
Any help provided would be tremendously helpful and I know would help others in the community.
Thanks!
I was having issues with UE5.0 source build so I deleted and re-downloaded UE5 Early Access. Getting this same error now when trying to build my Project I started with 5.0
Did you find a solution?
Have you found a solution to this?
I had the same error. Resolved with checking in the project the last changes i’ve made and actually i wrongly used “UFUNCTION(Server, Reliable)”. hope this helps
Had the same error.
It was because I installed RiderLink plugin as a UE5’s engine plugin. Apprently RiderLink preview has a bug, and it only works as a per-project plugin.
Removed the RiderLink folder from UE5’s engine plugin (Plugin/Developer/RiderLink) and reinstalled it in the project folder. And the project was finally built.
More here: Unreal Engine 5 - Jetbrains Rider Early Access - YouTube
Had a similar error and the issue was a file that Rider was trying to write to that was not checked out in Perforce and thus read-only on disk.
Rider somewhat unhelpfully collapses the error log into just that message, but you can expand it with a button on the left.
Hi!
I believe that found the problem, if the Live Coding configuration of integration is enable in your Unreal Engine 5, can be this that are creating the conflict of Mutex 
Try disable the Live Coding or press Ctrl+Alt+F11 in the editor(VS2022) or game, and try compile again.
This information are in a log file from Unreal Engine 5 in:
USERNAME/AppData/Local/UnrealBuildTool/Log.txt
See below the complete message:
Checking for live coding mutex: Global\LiveCoding_D++Epic Games+UE_5.1+Engine+Binaries+Win64+UnrealEditor.exe
Unable to build while Live Coding is active. Exit the editor and game, or press Ctrl+Alt+F11 if iterating on code in the editor or game
BuildException: Unable to build while Live Coding is active. Exit the editor and game, or press Ctrl+Alt+F11 if iterating on code in the editor or game
at UnrealBuildTool.HotReload.CheckForLiveCodingSessionActive(TargetDescriptor TargetDescriptor, TargetMakefile Makefile, BuildConfiguration BuildConfiguration, ILogger Logger) in D:\build++UE5\Sync\Engine\Saved\CsTools\Engine\Source\Programs\UnrealBuildTool\System\HotReload.cs:line 231
at UnrealBuildTool.BuildMode.Build(TargetMakefile[] Makefiles, List`1 TargetDescriptors, BuildConfiguration BuildConfiguration, BuildOptions Options, FileReference WriteOutdatedActionsFile, ILogger Logger) in D:\build++UE5\Sync\Engine\Saved\CsTools\Engine\Source\Programs\UnrealBuildTool\Modes\BuildMode.cs:line 526
at UnrealBuildTool.BuildMode.Execute(CommandLineArguments Arguments, ILogger Logger) in D:\build++UE5\Sync\Engine\Saved\CsTools\Engine\Source\Programs\UnrealBuildTool\Modes\BuildMode.cs:line 242
at UnrealBuildTool.UnrealBuildTool.Main(String[] ArgumentsArray) in D:\build++UE5\Sync\Engine\Saved\CsTools\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.cs:line 648
WriteFileIfChanged() wrote 0 changed files of 0 requested writes.
have many more informations, but are personal information from my project and path from ssd 
