fail to load `hostfxr.dll`

# Issue Title

using vscode debuging dotnetcore project

# General
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You may only use the Microsoft .NET Core Debugger (vsdbg) with
Visual Studio Code, Visual Studio or Visual Studio for Mac software
to help you develop and test your applications.
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Failed to load the dll from [c:\Users\heart\AppData\Roaming\Code\User\globalStorage\ms-vsliveshare.vsliveshare\dotnet-3.1.1\host\fxr\3.1.1\hostfxr.dll], HRESULT: 0x800700C1
The library hostfxr.dll was found, but loading it from c:\Users\heart\AppData\Roaming\Code\User\globalStorage\ms-vsliveshare.vsliveshare\dotnet-3.1.1\host\fxr\3.1.1\hostfxr.dll failed
- Installing .NET Core prerequisites might help resolve this problem.
https://go.microsoft.com/fwlink/?linkid=798306
目标进程已退出，但未引发 CoreCLR 启动事件。请确保将目标进程配置为使用 .NET Core。如果目标进程未运行 .NET Core，则发生这种情况并不意外。
程序“[4732] xxxxxx..exe”已退出，代码为 -2147450750 (0x80008082)。