Omnisharp-vscode: Error processing 'variables' request. Unknown Error: 0x8000211d

[rspaulino]

Issue Description

When I set a breakpoint and try to watch the value of a variable I get the following message
Error processing 'variables' request. Unknown Error: 0x8000211d

Steps to Reproduce

dotnet new web --no-https -n api
dotnet new sln
dotnet sln add api

``` c#
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
services.AddSingleton(new JsonSerializerOptions()
{
PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
PropertyNameCaseInsensitive = true,
});
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, JsonSerializerOptions serializerOptions)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }

    app.UseRouting();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapGet("/", async context =>
        {
            await context.Response.WriteAsync("Hello World!");
        });

        endpoints.MapPost("deposit", async context =>
        {
            var transaction = await context.Request.ReadFromJsonAsync<Transaction>();
            await context.Response.WriteAsync($"Hello World! {transaction.Id} {transaction.Amount} {transaction.Comment}");
        });
    });
}

}
```

dotnet run --project api

Set Breakpoint to see the value of transaction

curl -X POST http://localhost:5000/deposit -H "Content-Type: application/json" -d '{"Id":102,"Amount":200,"Comment":"rent"}'

Expected Behavior

Expected to see an object with this values: '{"Id":102,"Amount":200,"Comment":"rent"}'`

Actual Behavior

The variable show this value: Error processing 'variables' request. Unknown Error: 0x8000211d

Logs

OmniSharp log

Post the output from Output-->OmniSharp log here

C# log

Post the output from Output-->C# here

Environment information

VSCode version: 1.47.2
C# Extension: 1.22.1

Mono Information

OmniSharp using global mono :6.10.0

Dotnet Information

.NET SDK (reflecting any global.json):
Version: 5.0.100-preview.7.20366.6
Commit: 0684df3a5b

Runtime Environment:
OS Name: Mac OS X
OS Version: 10.15
OS Platform: Darwin
RID: osx.10.15-x64
Base Path: /usr/local/share/dotnet/sdk/5.0.100-preview.7.20366.6/

Host (useful for support):
Version: 5.0.0-preview.7.20364.11
Commit: 53976d38b1

.NET SDKs installed:
3.1.200 [/usr/local/share/dotnet/sdk]
3.1.202 [/usr/local/share/dotnet/sdk]
3.1.300 [/usr/local/share/dotnet/sdk]
3.1.301 [/usr/local/share/dotnet/sdk]
3.1.302 [/usr/local/share/dotnet/sdk]
5.0.100-preview.7.20366.6 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 3.1.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.4 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.5 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.6 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.0-preview.7.20365.19 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.16 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.17 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.18 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.19 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.20 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.2 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.4 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.5 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.6 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.0-preview.7.20364.11 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

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

Visual Studio Code Extensions

|Extension|Author|Version|
|---|---|---|
|azure-account|ms-vscode|0.8.11|
|csharp|ms-dotnettools|1.22.1|
|file-downloader|mindaro-dev|1.0.0|
|github-vscode-theme|GitHub|1.1.3|
|gitlens|eamodio|10.2.2|
|mindaro|mindaro|0.1.120200723|
|mssql|ms-mssql|1.9.0|
|python|ms-python|2020.7.94776|
|remote-containers|ms-vscode-remote|0.128.0|
|sonarlint-vscode|SonarSource|1.16.0|
|vscode-dapr|ms-azuretools|0.2.1|
|vscode-docker|ms-azuretools|1.4.1|
|vscode-kubernetes-tools|ms-kubernetes-tools|1.2.1|
|vscode-postgresql|ms-ossdata|0.3.0|
|vscode-sanddance|msrvida|3.0.0|
|vscode-solution-explorer|fernandoescolar|0.3.10|
|vscode-sqlite|alexcvzz|0.8.2|
|vscode-yaml|redhat|0.9.1|
|vscodeintellicode|VisualStudioExptTeam|1.2.9|
|vsliveshare|ms-vsliveshare|1.0.2478|
|vsliveshare-audio|ms-vsliveshare|0.1.85|;

[jmarolf]

@gregg-miskelly do you have any insights in to what could be happening here?

[gregg-miskelly]

@rspaulino Are you still seeing this problem? What version of .NET Core is your app running on?

[rspaulino]

@gregg-miskelly I just tested again and still happening.

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

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  10.15
 OS Platform: Darwin
 RID:         osx.10.15-x64
 Base Path:   /usr/local/share/dotnet/sdk/5.0.100-preview.8.20417.9/

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

Here is the project hope this can help:
ntmp.zip

[gregg-miskelly]

Thanks. I can reproduce the problem. I will take a look at what is going on.

[gregg-miskelly]

This is a bug with our handling of decimal types. The issue is already fixed internally, but we haven't pushed it to the extension yet. We were about to insert a new build that has the fix.

[rspaulino]

@gregg-miskelly great!, thanks.

[WennderSantos]

I am facing the same error. I tried to remove decimal properties just to test what @gregg-miskelly said about the problem and worked.

[mikes-gh]

@gregg-miskelly is there any timeline on the next build with this fix please

[mikes-gh]

@gregg-miskelly I used 1.23.3beta 3 and still had this issue

[gregg-miskelly]

Hopefully today, https://github.com/OmniSharp/omnisharp-vscode/pull/4091 will fix this.

[gregg-miskelly]

Fixed by https://github.com/OmniSharp/omnisharp-vscode/pull/4091

[eestein]

The same error happens on VS for mac, are you guys related to that one as well? Thanks.

[gregg-miskelly]

@eestein Thanks. We will work with the VS for Mac team to get the fix deployed there too.

[darkguy2008]

Same happening on VSCode for Windows. App is in .NET 5, how do I get the exception for you guys?

[mikes-gh]

@darkguy2008 are you using the latest vscode and omnisharp. This particular issue was fixed for me on windows and mac.

[gregg-miskelly]

@darkguy2008 If you are still seeing this using the current C# extension (1.23.6) please open a new issue and include a debugger log. Information about the types of all the variables you have in the current frame would also be useful.