asp.net core - one or more errors occurred failed to launch debug adapter Visual Studio 2019

Question

From today morning, my Visual Studio is behaving very strangely. I get the error "one or more errors occurred failed to launch debug adapter" whenever I run the project.

I run my project profile instead of running it in the IIS Express profile. Here is my launchSettings.json file.

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:65498",
      "sslPort": 44318
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "<ProjectName>": {
      "commandName": "Project",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      },
      "applicationUrl": "https://localhost:5001;http://localhost:5000"
    }
  }
}

And when I check the Output window, this is what I get.

The program '[22052] .exe' has exited with code -1 (0xffffffff).

Another thing I noticed is that a new browser tab is opened without any URL in it, just an about:blank page.

Answer 1

I am having this problem too and think it may have something to do with the Edge Browser(or an update?) and the JavaScript Debugger. The first time I run a WebApp, everything works fine. Every time afterwards, I receive the "failed to launch debug adapter" shown above.

I have to either disable the Javascript Debugger or Use Internet Explorer to run the app.