dotnet Core：升级到VS2017后调试无法打开浏览器

Question

我的launchSettings.json是（将launchUrl更改为applicationUrl后）：

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:5000/",
      "sslPort": 0
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      },
      "applicationUrl": "http://localhost:5050/"
    },
    "Project Development": {
      "commandName": "Project",
      "launchBrowser": true,
      "applicationUrl": "http://localhost:5050/"
    }
  }
}

以前两个配置文件都已打开http://localhost:5050/。现在第二个配置文件刚启动服务器，并首先显示“项目不知道如何运行配置文件IIS Express”错误。