I was getting this issue along with another issue ( "dontnet run" would through this error "Could not load file or assembly 'System.Runtime, Version=4.2.0.0'").

Since I was unable to resolve this issue, I tried tackling the "Could not load file" issue.

I found it referenced at this link https://github.com/dotnet/cli/issues/5528 with a solution.

The issue here is that the version included in the CLI's offline package cache of Microsoft.VisualStudio.Web.BrowserLink version 1.1.0 seems to be broken.
 If do rm -r ~/.nuget/packages/microsoft.visualstudio.web.browserlink and then run dotnet restore and dotnet run again, no issues occur.

I ran this "rm -r ~/.nuget/packages/microsoft.visualstudio.web.browserlink" statement.

Then I ran "dotnet restore".

This resolved both issues and makes sense.

VS2017 is using the same scaffolding as the CLI. So fixing the CLI fixed VS2017.

I hope this helps.

:)

Did any one solved this issue using VS 2017?

I think Microsoft Technical team needs to fix this bug instead of redirecting to this post.

Thank you for your feedback! As mentioned in the accepted solution, creating a new project in Visual Studio 2017 should fix this issue.

I am also having a same problem, but for me i am using VS 2015 Update 3 and i was creating sample application for Asp.net Core

What file I have to make this change in VS2017RC? My project is .NET Framework 4.6.2 ASP.NET Core Web Application(.NET Framework) and Core is 1.1

This error happens if the project is missing a tool reference.

Ensure that the project has the below for VS2017 RC:

<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="1.0.0-msbuild3-final" PrivateAssets="All" />
<DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="1.0.0-msbuild3-final" PrivateAssets="All" />

For VS2015:

"dependencies": {
...
    "Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
      "version": "1.0.0-preview4-final",
      "type": "build"
    },
    "Microsoft.VisualStudio.Web.CodeGenerators.Mvc": {
      "version": "1.0.0-preview4-final",
      "type": "build"
    }
...
},
"tools" : {
  "Microsoft.VisualStudio.Web.CodeGeneration.Tools" : {
      "version": "1.0.0-preview2-final",
      "imports": [
        "dnxcore50",
        "portable-net45+win8"
      ] 
  }
}

Note these are configurations for projects targeting 1.0.x runtime, for 1.1.x projects the versions have to be updated appropriately.