OmniSharp.MSBuild.MSBuildProjectSystem, Failed to load project file

[doomchild]

I made a brand new solution and project like so:

$ mkdir temp
$ cd temp
$ dotnet new sln
$ dotnet new console
$ dotnet sln add temp.csproj

Then I opened up ~/temp/Program.cs, started the omnisharp server, and looked at the *omnisharp-log* buffer. Here it is:

[22:46:21] Starting OmniSharpServer using project folder/solution file: /Users/{user}/temp/temp.sln
[22:46:21] Using server binary on /Users/{user}/.emacs.d/.cache/omnisharp/server/v1.26.3/run
[22:46:22] INFORMATION: OmniSharp.Stdio.Host, Starting OmniSharp on MacOS 10.13.3 (x64)
[22:46:22] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, Located 1 MSBuild instance(s)
            1: StandAlone 15.0 - "/Users/{user}/.emacs.d/.cache/omnisharp/server/v1.26.3/omnisharp/msbuild/15.0/Bin"
[22:46:22] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, MSBUILD_EXE_PATH environment variable set to '/Users/{user}/.emacs.d/.cache/omnisharp/server/v1.26.3/omnisharp/msbuild/15.0/Bin/MSBuild.dll'
[22:46:22] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, Registered MSBuild instance: StandAlone 15.0 - "/Users/{user}/.emacs.d/.cache/omnisharp/server/v1.26.3/omnisharp/msbuild/15.0/Bin"
            MSBuildExtensionsPath = /Users/{user}/.emacs.d/.cache/omnisharp/server/v1.26.3/omnisharp/msbuild
            CscToolPath = /Users/{user}/.emacs.d/.cache/omnisharp/server/v1.26.3/omnisharp/msbuild/15.0/Bin/Roslyn
            CscToolExe = csc.exe
            MSBuildToolsPath = /Users/{user}/.emacs.d/.cache/omnisharp/server/v1.26.3/omnisharp/msbuild/15.0/Bin
[22:46:22] INFORMATION: OmniSharp.Cake.CakeProjectSystem, Detecting Cake files in '/Users/{user}/temp'.
[22:46:22] INFORMATION: OmniSharp.Cake.CakeProjectSystem, Could not find any Cake files
[22:46:22] INFORMATION: OmniSharp.DotNet.DotNetProjectSystem, Initializing in /Users/{user}/temp
[22:46:22] INFORMATION: OmniSharp.DotNet.DotNetProjectSystem, Auto package restore: False
[22:46:22] INFORMATION: OmniSharp.DotNet.DotNetProjectSystem, Update workspace context
[22:46:22] INFORMATION: OmniSharp.DotNet.DotNetProjectSystem, Resolving projects references
[22:46:22] INFORMATION: OmniSharp.MSBuild.MSBuildProjectSystem, Detecting projects in '/Users/{user}/temp/temp.sln'.
[22:46:22] INFORMATION: OmniSharp.MSBuild.MSBuildProjectSystem, Loading project: /Users/{user}/temp/temp.csproj
[22:46:22] WARNING: OmniSharp.MSBuild.MSBuildProjectSystem, Failed to load project file '/Users/{user}/temp/temp.csproj'.
[22:46:23] INFORMATION: OmniSharp.Script.ScriptProjectSystem, Detecting CSX files in '/Users/{user}/temp'.
[22:46:23] INFORMATION: OmniSharp.Script.ScriptProjectSystem, Could not find any CSX files
[22:46:23] INFORMATION: OmniSharp.Stdio.Host, Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpWorkspaceOptionsProvider
[22:46:23] INFORMATION: OmniSharp.Stdio.Host, Configuration finished.
[22:46:23] INFORMATION: OmniSharp.Stdio.Host, Omnisharp server running using Stdio at location '/Users/{user}/temp' on host -1.
[22:46:26] <-- 81 /codecheck: ((QuickFixes . []))
[22:46:26] <-- 82 /codecheck: ((QuickFixes . []))
[22:46:29] <-- 83 /codecheck: ((QuickFixes . []))
[22:46:29] <-- 85 /typelookup: ((Type) (Documentation))
[22:46:29] <-- 84 /autocomplete: []
[22:46:29] <-- 86 /codecheck: ((QuickFixes . []))
[22:46:34] <-- 87 /autocomplete: []
[22:46:35] <-- 88 /codecheck: ((QuickFixes . []))

Why didn't Omnisharp load my brand-new project file?

[razzmatazz]

I did the same steps on macOS, and it did work for me..

[08:26:03] Starting OmniSharpServer using project folder/solution file: /Users/bob/tmp/emacs/temp/temp.sln
[08:26:03] Using server binary on /Users/bob/.emacs.d/.cache/omnisharp/server/v1.26.3/run
[08:26:04] INFORMATION: OmniSharp.Stdio.Host, Starting OmniSharp on MacOS 10.13.3 (x64)
[08:26:04] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, Located 1 MSBuild instance(s)
            1: StandAlone 15.0 - "/Users/bob/.emacs.d/.cache/omnisharp/server/v1.26.3/omnisharp/msbuild/15.0/Bin"
[08:26:04] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, MSBUILD_EXE_PATH environment variable set to '/Users/bob/.emacs.d/.cache/omnisharp/server/v1.26.3/omnisharp/msbuild/15.0/Bin/MSBuild.dll'
[08:26:04] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, Registered MSBuild instance: StandAlone 15.0 - "/Users/bob/.emacs.d/.cache/omnisharp/server/v1.26.3/omnisharp/msbuild/15.0/Bin"
            MSBuildExtensionsPath = /Library/Frameworks/Mono.framework/Versions/5.10.0/lib/mono/xbuild
            CscToolPath = /Users/bob/.emacs.d/.cache/omnisharp/server/v1.26.3/omnisharp/msbuild/15.0/Bin/Roslyn
            CscToolExe = csc.exe
            MSBuildToolsPath = /Users/bob/.emacs.d/.cache/omnisharp/server/v1.26.3/omnisharp/msbuild/15.0/Bin
            TargetFrameworkRootPath = /Library/Frameworks/Mono.framework/Versions/5.10.0/lib/mono/xbuild-frameworks
[08:26:05] INFORMATION: OmniSharp.Cake.CakeProjectSystem, Detecting Cake files in '/Users/bob/tmp/emacs/temp'.
[08:26:05] INFORMATION: OmniSharp.Cake.CakeProjectSystem, Could not find any Cake files
[08:26:05] INFORMATION: OmniSharp.DotNet.DotNetProjectSystem, Initializing in /Users/bob/tmp/emacs/temp
[08:26:05] INFORMATION: OmniSharp.DotNet.DotNetProjectSystem, Auto package restore: False
[08:26:05] INFORMATION: OmniSharp.DotNet.DotNetProjectSystem, Update workspace context
[08:26:05] INFORMATION: OmniSharp.DotNet.DotNetProjectSystem, Resolving projects references
[08:26:05] INFORMATION: OmniSharp.MSBuild.MSBuildProjectSystem, Detecting projects in '/Users/bob/tmp/emacs/temp/temp.sln'.
[08:26:05] INFORMATION: OmniSharp.MSBuild.MSBuildProjectSystem, Loading project: /Users/bob/tmp/emacs/temp/temp.csproj
[08:26:08] INFORMATION: OmniSharp.MSBuild.MSBuildProjectSystem, Update project: temp
[08:26:08] INFORMATION: OmniSharp.Script.ScriptProjectSystem, Detecting CSX files in '/Users/bob/tmp/emacs/temp'.
[08:26:08] INFORMATION: OmniSharp.Script.ScriptProjectSystem, Could not find any CSX files
[08:26:08] INFORMATION: OmniSharp.Stdio.Host, Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpWorkspaceOptionsProvider
[08:26:08] INFORMATION: OmniSharp.Stdio.Host, Configuration finished.
[08:26:08] INFORMATION: OmniSharp.Stdio.Host, Omnisharp server running using Stdio at location '/Users/bob/tmp/emacs/temp' on host -1.
[08:26:09] <-- 1867 /currentfilemembersasflat: [((FileName) (Line . 5) (Column . 11) (EndLine . 5) (EndColumn . 18) (Text . "Program") (Projects . [])) ((FileName) (Line . 7) (Column . 21) (EndLine . 7) (EndColumn . 25) (Text . "Main") (Projects . []))]
[08:26:10] <-- 1866 /codecheck: ((QuickFixes . []))
[08:26:11] <-- 1868 /typelookup: ((Type) (Documentation))

Does the .csproj file still actually exists there on the path in .sln?

Could you try using a later server version, just in case they provide more diagnostic information on the log (by changing the omnisharp-expected-server-version) variable and invoking M-x omnisharp-install-server?

[doomchild]

I set omnisharp-expected-server-version to "1.29.1" (the latest release), and got the same result.

[11:11:38] Starting OmniSharpServer using project folder/solution file: /Users/doomchild/temp/
[11:11:38] Using server binary on /Users/doomchild/.emacs.d/.cache/omnisharp/server/v1.29.1/run
[11:11:39] INFORMATION: OmniSharp.Stdio.Host, Starting OmniSharp on MacOS 10.13.3 (x64)
[11:11:39] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, Located 1 MSBuild instance(s)
            1: StandAlone 15.0 - "/Users/doomchild/.emacs.d/.cache/omnisharp/server/v1.29.1/omnisharp/msbuild/15.0/Bin"
[11:11:39] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, MSBUILD_EXE_PATH environment variable set to '/Users/doomchild/.emacs.d/.cache/omnisharp/server/v1.29.1/omnisharp/msbuild/15.0/Bin/MSBuild.dll'
[11:11:39] INFORMATION: OmniSharp.MSBuild.Discovery.MSBuildLocator, Registered MSBuild instance: StandAlone 15.0 - "/Users/doomchild/.emacs.d/.cache/omnisharp/server/v1.29.1/omnisharp/msbuild/15.0/Bin"
            MSBuildExtensionsPath = /Users/doomchild/.emacs.d/.cache/omnisharp/server/v1.29.1/omnisharp/msbuild
            CscToolPath = /Users/doomchild/.emacs.d/.cache/omnisharp/server/v1.29.1/omnisharp/msbuild/15.0/Bin/Roslyn
            CscToolExe = csc.exe
            MSBuildToolsPath = /Users/doomchild/.emacs.d/.cache/omnisharp/server/v1.29.1/omnisharp/msbuild/15.0/Bin
[11:11:39] INFORMATION: OmniSharp.Cake.CakeProjectSystem, Detecting Cake files in '/Users/doomchild/temp/'.
[11:11:39] INFORMATION: OmniSharp.Cake.CakeProjectSystem, Could not find any Cake files
[11:11:39] INFORMATION: OmniSharp.DotNet.DotNetProjectSystem, Initializing in /Users/doomchild/temp/
[11:11:39] INFORMATION: OmniSharp.DotNet.DotNetProjectSystem, Auto package restore: False
[11:11:39] INFORMATION: OmniSharp.DotNet.DotNetProjectSystem, Update workspace context
[11:11:39] INFORMATION: OmniSharp.DotNet.DotNetProjectSystem, Resolving projects references
[11:11:39] INFORMATION: OmniSharp.MSBuild.ProjectSystem, Detecting projects in '/Users/doomchild/temp/temp.sln'.
[11:11:39] INFORMATION: OmniSharp.MSBuild.ProjectManager, Queue project update for '/Users/doomchild/temp/temp.csproj'
[11:11:39] INFORMATION: OmniSharp.Script.ScriptProjectSystem, Detecting CSX files in '/Users/doomchild/temp/'.
[11:11:39] INFORMATION: OmniSharp.Script.ScriptProjectSystem, Could not find any CSX files
[11:11:39] INFORMATION: OmniSharp.Stdio.Host, Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpWorkspaceOptionsProvider
[11:11:39] INFORMATION: OmniSharp.Stdio.Host, Configuration finished.
[11:11:39] INFORMATION: OmniSharp.Stdio.Host, Omnisharp server running using Stdio at location '/Users/doomchild/temp/' on host -1.
[11:11:39] INFORMATION: OmniSharp.MSBuild.ProjectManager, Loading project: /Users/doomchild/temp/temp.csproj
[11:11:39] WARNING: OmniSharp.MSBuild.ProjectManager, Failed to load project file '/Users/doomchild/temp/temp.csproj'.

The .csproj file is in the same directory as the solution file:

TMA-1:temp doomchild  λ ll
total 24
drwxr-xr-x    6 doomchild  staff   192 Mar 14 22:55 ./
drwxr-xr-x@ 143 doomchild  staff  4576 Mar 14 22:45 ../
-rw-r--r--    1 doomchild  staff   186 Mar 14 22:45 Program.cs
drwxr-xr-x    6 doomchild  staff   192 Mar 14 22:45 obj/
-rw-r--r--    1 doomchild  staff   178 Mar 14 22:45 temp.csproj
-rw-r--r--    1 doomchild  staff  1679 Mar 14 22:46 temp.sln

I haven't modified the .csproj file at all, and the only modification to the solution file was adding the .csproj to it (via dotnet sln add temp.csproj).

[razzmatazz]

You probably want to register an issue in the https://github.com/OmniSharp/omnisharp-roslyn/ repository. Maintainers of the language server will now more about this..

[doomchild]

Fair enough.

[kpace]

@doomchild Do you have any fix on this? Thanks!

[doomchild]

I made an issue on the omnisharp-roslyn repo (OmniSharp/omnisharp-roslyn#1135). I haven't heard anything back yet.

[razzmatazz]

Have you tried loading the solution with visual studio code (it uses the same omnisharp server but maybe a more up-to-date version) Otherwise could you post the sources in a zip – so I could try to load it on my machine–maybe there is a .net ask mismatch or something that makes the project not load on your machine even though I run the same steps on the shell/command line. —Saulius Menkevičius

…

Am 27.03.2018 um 05:34 schrieb Lee Crabtree ***@***.***>: I made an issue on the omnisharp-roslyn repo (OmniSharp/omnisharp-roslyn#1135). I haven't heard anything back yet. — You are receiving this because you commented. Reply to this email directly, view it on GitHub, or mute the thread.

[doomchild]

Here are the sources. I created this using the above commands.
temp.zip

[kirill-gerasimenko]

Hi,
I've got the same issue. I'm running Manjaro, latest dotnet core, latest mono, Omnisharp 1.26.3, Emacs 25.3.1

[kirill-gerasimenko]

Actually I've just solved my problem by installing msbuild-stable 15.4_xamarinxplat.2017.11.27.11.23_0xamarin1_ubuntu1404b1-3 package.

I hope it helps.

[razzmatazz]

@kirill-gerasimenko -- thanks, will add this to the README.txt/troubleshooting section

[nightkr]

FWIW I was having the same issue, installing msbuild from Nixpkgs or mono-xbuild from Ubuntu did not help at all. Finally, it seems like upgrading OmniSharp-Roslyn to 1.34.13 ((setq omnisharp-expected-server-version "1.34.13")) fixed it.