Update building-code.md

Documentation/building-code.md

@@ -125,9 +125,6 @@ You can run (and debug) AutoRest by providing the command line parameters in the
 
 #### Troubleshooting
 
-#####If the Client Runtime project.json shows an error for Newtonsoft.Json, saying that the dependency does not support framework `.NETPortable,Version=4.5,Profile=111`
-There is an issue with DNX 1.0.0-rc1 for optional frameworks: [https://github.com/aspnet/dnx/issues/2967](https://github.com/aspnet/dnx/issues/2967). If you have Xamarin files in the directory `C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETPortable\v4.5\Profile\Profile111\SupportedFrameworks`, then it will not be able to find the Newtonsoft.Json dependency.
-
 #####If the task runner window in Visual Studio does not show any tasks
 Make sure that you have run `npm install` in the root folder.
 
@@ -137,9 +134,6 @@ Make sure that you have built the entire `AutoRest.sln` solution.
 #####If you see the error `gulp is not recognized as an internal or external command`
 `gulp` is located at `C:\Users\[user]\AppData\Roaming\npm\gulp` in Windows after you install it globally.
 
-#####If you see an error about the target framework not being available
-Make sure that the correct DNX version is being used with `dnvm upgrade -r coreclr -arch x64`.
-
 # Releasing AutoRest and ClientRuntimes
 
  - [ ] Merge pending PRs into the master branch