Omnisharp-vscode: Error: The reference assemblies for .NETFramework,Version=v5.0 were not found.

Created on 2 Sep 2020  路  6Comments  路  Source: OmniSharp/omnisharp-vscode

Issue Description

after upgrading to .NET 5 preview 8, I couldn't start in visual studio code project without error. stuck for days now, need some help. thank you

Environment data

dotnet --info output:

$ dotnet --info
.NET SDK (reflecting any global.json):
 Version:   5.0.100-preview.8.20417.9
 Commit:    fc62663a35

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.17763
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\5.0.100-preview.8.20417.9\

Host (useful for support):
  Version: 5.0.0-preview.8.20407.11
  Commit:  bf456654f9

.NET SDKs installed:
  2.1.202 [C:\Program Files\dotnet\sdk]
  2.1.602 [C:\Program Files\dotnet\sdk]
  2.1.701 [C:\Program Files\dotnet\sdk]
  2.1.801 [C:\Program Files\dotnet\sdk]
  2.2.100 [C:\Program Files\dotnet\sdk]
  2.2.101 [C:\Program Files\dotnet\sdk]
  2.2.202 [C:\Program Files\dotnet\sdk]
  2.2.301 [C:\Program Files\dotnet\sdk]
  2.2.401 [C:\Program Files\dotnet\sdk]
  3.0.100 [C:\Program Files\dotnet\sdk]
  3.1.101 [C:\Program Files\dotnet\sdk]
  3.1.401 [C:\Program Files\dotnet\sdk]
  5.0.100-preview.8.20417.9 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.21 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.2.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.21 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.0-preview.8.20414.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.21 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.0-preview.8.20407.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.0-preview.8.20411.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download

VS Code version:
C# Extension version:

OmniSharp log

Starting OmniSharp server at 9/3/2020, 1:21:58 AM
    Target: d:\Developer\dotnet\ScyllaTest

OmniSharp server started.
    Path: c:\Users\jeanepaul\.vscode\extensions\ms-dotnettools.csharp-1.23.1\.omnisharp\1.37.0\OmniSharp.exe
    PID: 26400

[info]: OmniSharp.Stdio.Host
        Starting OmniSharp on Windows 6.2.9200.0 (x64)
[info]: OmniSharp.Services.DotNetCliService
        DotNetPath set to dotnet
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Located 3 MSBuild instance(s)
            1: Visual Studio Build Tools 2019 16.7.30413.136 - "D:\msvisualstudio\build_tools\MSBuild\Current\Bin"
            2: Visual Studio Community 2019 16.7.30413.136 - "D:\msvisualstudio\new_msvisualstudio\MSBuild\Current\Bin"
            3: StandAlone 16.8.0 - "c:\Users\jeanepaul\.vscode\extensions\ms-dotnettools.csharp-1.23.1\.omnisharp\1.37.0\.msbuild\Current\Bin"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Registered MSBuild instance: Visual Studio Build Tools 2019 16.7.30413.136 - "D:\msvisualstudio\build_tools\MSBuild\Current\Bin"
[info]: OmniSharp.Cake.CakeProjectSystem
        Detecting Cake files in 'd:\Developer\dotnet\ScyllaTest'.
[info]: OmniSharp.Cake.CakeProjectSystem
        Could not find any Cake files
[info]: OmniSharp.MSBuild.ProjectSystem
        No solution files found in 'd:\Developer\dotnet\ScyllaTest'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'd:\Developer\dotnet\ScyllaTest\ScyllaTest.csproj'
[info]: OmniSharp.Script.ScriptProjectSystem
        Detecting CSX files in 'd:\Developer\dotnet\ScyllaTest'.
[info]: OmniSharp.Script.ScriptProjectSystem
        Could not find any CSX files
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpFormattingWorkspaceOptionsProvider, Order: 0
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: d:\Developer\dotnet\ScyllaTest\ScyllaTest.csproj
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.RenameWorkspaceOptionsProvider, Order: 100
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.ImplementTypeWorkspaceOptionsProvider, Order: 110
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.BlockStructureWorkspaceOptionsProvider, Order: 140
[info]: OmniSharp.WorkspaceInitializer
        Configuration finished.
[info]: OmniSharp.Stdio.Host
        Omnisharp server running using Stdio at location 'd:\Developer\dotnet\ScyllaTest' on host 29472.
[fail]: OmniSharp.MSBuild.ProjectLoader
        The reference assemblies for .NETFramework,Version=v5.0 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks
[warn]: OmniSharp.MSBuild.ProjectManager
        Failed to load project file 'd:\Developer\dotnet\ScyllaTest\ScyllaTest.csproj'.
d:\Developer\dotnet\ScyllaTest\ScyllaTest.csproj
D:\msvisualstudio\build_tools\MSBuild\Current\Bin\Microsoft.Common.CurrentVersion.targets(1177,5): Error: The reference assemblies for .NETFramework,Version=v5.0 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks

[fail]: OmniSharp.MSBuild.ProjectManager
        Attempted to update project that is not loaded: d:\Developer\dotnet\ScyllaTest\ScyllaTest.csproj

Steps to reproduce

Expected behavior

Actual behavior

picture Hokutosei

Most helpful comment

Question: Why can't we use the StandAlone 16.8.0?

picture imba-tjd on 21 Oct 2020
👍3

All 6 comments

@Hokutosei Sorry you are running into this issue. The .NET 5 Preview 8 SDK requires MSBuild 16.8 or higher.

[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Registered MSBuild instance: Visual Studio Build Tools 2019 16.7.30413.136 - "D:\msvisualstudio\build_tools\MSBuild\Current\Bin"

From the OmniSharp log it is picking up version 16.7. You will need to install the VS 16.8 Preview Build Tools to use the Preview 8 SDK.

JoeRobich picture JoeRobich on 2 Sep 2020

@JoeRobich sorry for late report, it seems the error is gone after installing VS 2019 16.8 preview. but now, I have multiple visual studio.. 16.7, and 16.8 preview 馃様
vs18_8

Hokutosei picture Hokutosei on 4 Sep 2020

Once you've downloaded Visual Studio, make sure you enable .NET previews within the program:

Go to Tools > Options > Preview Features > Select "Use previews of the .NET Core SDK (requires restart)".

namhnz picture namhnz on 23 Sep 2020

Go to Tools > Options > Preview Features > Select "Use previews of the .NET Core SDK (requires restart)".

I'm not seeing this option. This is for VS Community Preview right? I'm using version 4.8.04084.

image

reinux picture reinux on 25 Sep 2020

by design

jmarolf picture jmarolf on 30 Sep 2020

Question: Why can't we use the StandAlone 16.8.0?

imba-tjd picture imba-tjd on 21 Oct 2020
👍3
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