$ dotnet fake run build.fsx -t ReleaseDocs

output.log

Extracted Paket.Restore.targets to: /home/adam/projects/libs/FSharpPlus/.paket/Paket.Restore.targets (Can be disabled with PAKET_SKIP_RESTORE_TARGETS=true)
The last restore is still up to date. Nothing left to do.
run ReleaseDocs
Building project with version: LocalBuild
Shortened DependencyGraph for Target ReleaseDocs:
<== ReleaseDocs
   <== All
      <== BuildDocs
         <== BuildPackage
            <== CopyNuGet
               <== NuGet
                  <== RunTests
                     <== CopyBinaries
                        <== Build
                           <== Restore
                              <== AssemblyInfo
                                 <== Clean
         <== GenerateDocs
            <== GenerateReferenceDocs
               <== GenerateHelp

The running order is:
Group - 1
  - Clean
Group - 2
  - AssemblyInfo
Group - 3
  - Restore
Group - 4
  - Build
Group - 5
  - CopyBinaries
Group - 6
  - GenerateHelp
  - RunTests
Group - 7
  - GenerateReferenceDocs
  - NuGet
Group - 8
  - GenerateDocs
  - CopyNuGet
Group - 9
  - BuildPackage
Group - 10
  - BuildDocs
Group - 11
  - All
Group - 12
  - ReleaseDocs
Starting target 'Clean'
Starting task 'MSBuild': /home/adam/projects/libs/FSharpPlus/FSharpPlus.sln
> "/usr/bin/mono" --version (In: false, Out: true, Err: true)
> "/usr/bin/xbuild" /version /nologo (In: false, Out: true, Err: true)
Could not detect msbuild version from '/usr/bin/xbuild': System.ArgumentException: Version string portion was too short or too long. (Parameter 'input')
   at System.Version.ParseVersion(ReadOnlySpan`1 input, Boolean throwOnFailure)
   at System.Version.Parse(String input)
   at Fake.DotNet.MSBuild.getFromCall@690(String exePath, FSharpFunc`2 callMsbuildExe, Unit unitVar0) in d:\a\1\s\src\app\Fake.DotNet.MSBuild\MSBuild.fs:line 695
msbuild version '13.0.0.0' doesn't support binary logger, please set the msbuild argument 'DisableInternalBinLog' to 'true' to disable this warning.
/usr/bin/xbuild  /home/adam/projects/libs/FSharpPlus/FSharpPlus.sln /restore /t:Clean /p:RestorePackages=False /p:Optimize=True /p:DebugSymbols=True /p:Configuration=Release "/p:Platform=Any CPU" "/p:PackageReleaseNotes=More Fable support" /p:VersionSuffix=RC1 /p:VersionPrefix=1.1.0 /p:Configuration=Release
/home/adam/projects/libs/FSharpPlus> "/usr/bin/xbuild"  /home/adam/projects/libs/FSharpPlus/FSharpPlus.sln /restore /t:Clean /p:RestorePackages=False /p:Optimize=True /p:DebugSymbols=True /p:Configuration=Release "/p:Platform=Any CPU" "/p:PackageReleaseNotes=More Fable support" /p:VersionSuffix=RC1 /p:VersionPrefix=1.1.0 /p:Configuration=Release (In: false, Out: false, Err: false)

>>>> xbuild tool is deprecated and will be removed in future updates, use msbuild instead <<<<

MSBUILD: error MSBUILD0004: Too many project files specified
Finished (Failed) 'MSBuild' in 00:00:00.3864416
Finished (Failed) 'Clean' in 00:00:00.4976231

---------------------------------------------------------------------
Build Time Report
---------------------------------------------------------------------
Target                  Duration
------                  --------
Clean                   00:00:00.4955896   (Exception of type 'Fake.DotNet.MSBuildException' was thrown.)
AssemblyInfo            00:00:00           (skipped)
Restore                 00:00:00           (skipped)
Build                   00:00:00           (skipped)
CopyBinaries            00:00:00           (skipped)
GenerateHelp            00:00:00           (skipped)
RunTests                00:00:00           (skipped)
GenerateReferenceDocs   00:00:00           (skipped)
NuGet                   00:00:00           (skipped)
GenerateDocs            00:00:00           (skipped)
CopyNuGet               00:00:00           (skipped)
BuildPackage            00:00:00           (skipped)
BuildDocs               00:00:00           (skipped)
All                     00:00:00           (skipped)
ReleaseDocs             00:00:00           (skipped)
Total:                  00:00:00.5630247
Status:                 Failure
---------------------------------------------------------------------
Script reported an error:
-> BuildFailedException: Target 'Clean' failed.
-> One or more errors occurred. (Exception of type 'Fake.DotNet.MSBuildException' was thrown.)
-> MSBuildException: Exception of type 'Fake.DotNet.MSBuildException' was thrown.
Hint: To further diagnose the problem you can run fake in verbose mode `fake -v run ...` or set the 'FAKE_DETAILED_ERRORS' environment variable to 'true'
Hint: Could not find a version in your paket.dependencies file, consider adding 'version 5.241.2' at the top of your dependencies file (/home/adam/projects/libs/FSharpPlus/paket.dependencies).
Read https://github.com/fsharp/FAKE/issues/2193 for details.
Performance:
 - Cli parsing: 168 milliseconds
 - Packages: 50 milliseconds
 - Script analyzing: 16 milliseconds
 - Script running: 728 milliseconds
 - Script cleanup: 55 milliseconds
 - Runtime: 1 second