Cannot reference the .NetFramework when opening script in the Unity, VScode

I want to use vsCode as the script editor for the Unity. Therefore, I've installed the dotNet Framework by the link from vsCode output. https://aka.ms/msbuild/developerpacks

Also, I've installed

1. Mono
2. TargetingPack

I still get the warning, however, when I opened the script from the Unity.

Do I need to reinstall something, or I missed something to make it right? Any help is highly appreciated.

Here is my output

Starting OmniSharp server at 2020/7/25 下午12:19:07
Target: d:\Unity\MyFirstGame\MyFirstGame.sln

OmniSharp server started.
Path: c:\Users\alex0\.vscode\extensions\ms-dotnettools.csharp-1.22.1\.omnisharp\1.35.3\OmniSharp.exe
PID: 12524

[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 1 MSBuild instance(s)
        1: StandAlone 16.4 - "c:\Users\alex0\.vscode\extensions\ms-dotnettools.csharp-1.22.1\.omnisharp\1.35.3\.msbuild\Current\Bin"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
    MSBUILD_EXE_PATH environment variable set to 'c:\Users\alex0\.vscode\extensions\ms-dotnettools.csharp-1.22.1\.omnisharp\1.35.3\.msbuild\Current\Bin\MSBuild.exe'
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
    Registered MSBuild instance: StandAlone 16.4 - "c:\Users\alex0\.vscode\extensions\ms-dotnettools.csharp-1.22.1\.omnisharp\1.35.3\.msbuild\Current\Bin"
        CscToolExe = csc.exe
        CscToolPath = c:\Users\alex0\.vscode\extensions\ms-dotnettools.csharp-1.22.1\.omnisharp\1.35.3\.msbuild\Current\Bin\Roslyn
        MSBuildExtensionsPath = c:\Users\alex0\.vscode\extensions\ms-dotnettools.csharp-1.22.1\.omnisharp\1.35.3\.msbuild
        MSBuildToolsPath = c:\Users\alex0\.vscode\extensions\ms-dotnettools.csharp-1.22.1\.omnisharp\1.35.3\.msbuild\Current\Bin
[info]: OmniSharp.Cake.CakeProjectSystem
    Detecting Cake files in 'd:\Unity\MyFirstGame'.
[info]: OmniSharp.Cake.CakeProjectSystem
    Could not find any Cake files
[info]: OmniSharp.MSBuild.ProjectSystem
    Detecting projects in 'd:\Unity\MyFirstGame\MyFirstGame.sln'.
[info]: OmniSharp.MSBuild.ProjectManager
    Queue project update for 'd:\Unity\MyFirstGame\Assembly-CSharp.csproj'
[info]: OmniSharp.Script.ScriptProjectSystem
    Detecting CSX files in 'd:\Unity\MyFirstGame'.
[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:\Unity\MyFirstGame\Assembly-CSharp.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:\Unity\MyFirstGame' on host 10864.
[fail]: OmniSharp.MSBuild.ProjectLoader
    The reference assemblies for .NETFramework,Version=v4.7.1 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:\Unity\MyFirstGame\Assembly-CSharp.csproj'.
d:\Unity\MyFirstGame\Assembly-CSharp.csproj
c:\Users\alex0\.vscode\extensions\ms-dotnettools.csharp-1.22.1\.omnisharp\1.35.3\.msbuild\Current\Bin\Microsoft.Common.CurrentVersion.targets(1177,5): Error: The reference assemblies for .NETFramework,Version=v4.7.1 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:\Unity\MyFirstGame\Assembly-CSharp.csproj

and I also get this when opening the script:

Looking for git in: C:\Program Files\Git\cmd\git.exe
Using git 2.27.0.windows.1 from C:\Program Files\Git\cmd\git.exe
> git rev-parse --show-toplevel
fatal: not a git repository (or any of the parent directories): .git
> git rev-parse --show-toplevel
fatal: not a git repository (or any of the parent directories): .git
> git rev-parse --show-toplevel
fatal: not a git repository (or any of the parent directories): .git
> git rev-parse --show-toplevel
> git rev-parse --show-toplevel
fatal: not a git repository (or any of the parent directories): .git
> git rev-parse --show-toplevel
fatal: not a git repository (or any of the parent directories): .git
> git rev-parse --show-toplevel
fatal: not a git repository (or any of the parent directories): .git
> git rev-parse --show-toplevel
> git rev-parse --show-toplevel
fatal: not a git repository (or any of the parent directories): .git
> git rev-parse --show-toplevel
fatal: not a git repository (or any of the parent directories): .git
> git rev-parse --show-toplevel
fatal: not a git repository (or any of the parent directories): .git
> git rev-parse --show-toplevel
fatal: not a git repository (or any of the parent directories): .git
> git rev-parse --show-toplevel
fatal: not a git repository (or any of the parent directories): .git
> git rev-parse --show-toplevel
fatal: not a git repository (or any of the parent directories): .git