Building on Linux cant even generate project files

Development Programming & Scripting
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Unhandled exception: System.NullReferenceException: Object reference not set to an instance of an object.
at UnrealBuildTool.VSCodeProjectFileGenerator.WriteConfiguration(String Name, String ProjectName, IEnumerable1 SourceFiles, CppStandardVersion CppStandard, FileReference CompilerPath, DirectoryReference SysRootPath, Dictionary2 ModuleCommandLines, JsonFile OutFile, DirectoryReference OutputDirectory) in /home/david/Documents/Demon.mainline/Engine/Source/Programs/UnrealBuildTool/ProjectFiles/VisualStudioCode/VSCodeProjectFileGenerator.cs:line 670
at UnrealBuildTool.VSCodeProjectFileGenerator.WriteCppPropertiesFile(DirectoryReference OutputDirectory, ProjectData Projects) in /home/david/Documents/Demon.mainline/Engine/Source/Programs/UnrealBuildTool/ProjectFiles/VisualStudioCode/VSCodeProjectFileGenerator.cs:line 656
at UnrealBuildTool.VSCodeProjectFileGenerator.WritePrimaryProjectFile(ProjectFile UBTProject, PlatformProjectGeneratorCollection PlatformProjectGenerators, ILogger Logger) in /home/david/Documents/Demon.mainline/Engine/Source/Programs/UnrealBuildTool/ProjectFiles/VisualStudioCode/VSCodeProjectFileGenerator.cs:line 281
at UnrealBuildTool.ProjectFileGenerator.WriteProjectFiles(PlatformProjectGeneratorCollection PlatformProjectGenerators, ILogger Logger) in /home/david/Documents/Demon.mainline/Engine/Source/Programs/UnrealBuildTool/ProjectFiles/ProjectFileGenerator.cs:line 2829
at UnrealBuildTool.ProjectFileGenerator.GenerateProjectFiles(PlatformProjectGeneratorCollection PlatformProjectGenerators, String[] Arguments, ILogger Logger) in /home/david/Documents/Demon.mainline/Engine/Source/Programs/UnrealBuildTool/ProjectFiles/ProjectFileGenerator.cs:line 1176
at UnrealBuildTool.GenerateProjectFilesMode.Execute(CommandLineArguments Arguments, ILogger Logger) in /home/david/Documents/Demon.mainline/Engine/Source/Programs/UnrealBuildTool/Modes/GenerateProjectFilesMode.cs:line 233
at UnrealBuildTool.UnrealBuildTool.Main(String[] ArgumentsArray) in /home/david/Documents/Demon.mainline/Engine/Source/Programs/UnrealBuildTool/UnrealBuildTool.cs:line 648

This is what i get if i try to generate project files …

Thanks for your help.

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Similar Problem, i try to move UE project from win to Linux_UE_5.1.1. Although clean build binaries and intermediate results carefully. Exception occurred Unhandled exception: System.NullReferenceException: Object reference not set to an instance of an object. at UnrealBuildTool.VSCodeProjectFileGenerator.WriteConfiguration(String Name, String ProjectName, IEnumerable1 SourceFiles, CppStandardVersion CppStandard, FileReference CompilerPath, DirectoryReference SysRootPath, Dictionary2 ModuleCommandLines, JsonFile OutFile, DirectoryReference OutputDirectory) in /mnt/horde/++UE5/Sync/Engine/Saved/CsTools/Engine/Source/Programs/UnrealBuildTool/ProjectFiles/VisualStudioCode/VSCodeProjectFileGenerator.cs:line 670 at UnrealBuildTool.VSCodeProjectFileGenerator.WriteCppPropertiesFile(DirectoryReference OutputDirectory, ProjectData Projects) in /mnt/horde/++UE5/Sync/Engine/Saved/CsTools/Engine/Source/Programs/UnrealBuildTool/ProjectFiles/VisualStudioCode/VSCodeProjectFileGenerator.cs:line 656 at UnrealBuildTool.VSCodeProjectFileGenerator.WritePrimaryProjectFile(ProjectFile UBTProject, PlatformProjectGeneratorCollection PlatformProjectGenerators, ILogger Logger) in /mnt/horde/++UE5/Sync/Engine/Saved/CsTools/Engine/Source/Programs/UnrealBuildTool/ProjectFiles/VisualStudioCode/VSCodeProjectFileGenerator.cs:line 281 at UnrealBuildTool.ProjectFileGenerator.WriteProjectFiles(PlatformProjectGeneratorCollection PlatformProjectGenerators, ILogger Logger) in /mnt/horde/++UE5/Sync/Engine/Saved/CsTools/Engine/Source/Programs/UnrealBuildTool/ProjectFiles/ProjectFileGenerator.cs:line 2821 at UnrealBuildTool.ProjectFileGenerator.GenerateProjectFiles(PlatformProjectGeneratorCollection PlatformProjectGenerators, String[] Arguments, ILogger Logger) in /mnt/horde/++UE5/Sync/Engine/Saved/CsTools/Engine/Source/Programs/UnrealBuildTool/ProjectFiles/ProjectFileGenerator.cs:line 1176 at UnrealBuildTool.GenerateProjectFilesMode.Execute(CommandLineArguments Arguments, ILogger Logger) in /mnt/horde/++UE5/Sync/Engine/Saved/CsTools/Engine/Source/Programs/UnrealBuildTool/Modes/GenerateProjectFilesMode.cs:line 233 at UnrealBuildTool.UnrealBuildTool.Main(String[] ArgumentsArray) in /mnt/horde/++UE5/Sync/Engine/Saved/CsTools/Engine/Source/Programs/UnrealBuildTool/UnrealBuildTool.cs:line 648

  1. I try to regenerate project also get this error. Tried to use Mono yet cannot find .exe “DotNET/UnrealBuildTool/UnrealBuildTool.exe” like in UE4.
  2. After that, seems no exe anymore in UE5. Tried ‘Engine/Build/BatchFiles/Linux/Build.sh’ still show aforementioned error.