I cloned the ASP.NET Core SignalR Repo locally, and try opening the solution from within the following environment.

IDE

Microsoft Visual Studio Enterprise 2015
Version 14.0.25431.01 Update 3
Microsoft .NET Framework
Version 4.6.01055

DOT NET CLI

λ dotnet --info
.NET Command Line Tools (1.0.0-preview2-1-003177)

Product Information:
 Version:            1.0.0-preview2-1-003177
 Commit SHA-1 hash:  a2df9c2576

Runtime Environment:
 OS Name:     Windows
 OS Version:  6.1.7601
 OS Platform: Windows
 RID:         win7-x64

I end up seeing a lot of these kinds of error messages:

  
..ReposSignalRsrcMicrosoft.AspNetCore.SignalRMicrosoft.AspNetCore.SignalR.csproj
  : error  : The default XML namespace of the project must be the
  MSBuild XML namespace. If the project is authored in the MSBuild 2003
  format, please add
  xmlns="http://schemas.microsoft.com/developer/msbuild/2003" to the
   element. If the project has been authored in the old 1.0 or
  1.2 format, please convert it to MSBuild 2003 format.  ..ReposSignalRsrcMicrosoft.AspNetCore.SignalRMicrosoft.AspNetCore.SignalR.csproj

I want to know how to fix this the correct way.