When running: dnu build, here are the first problems: ... Using Package dependen...

When running: dnu build, here are the first problems:

  ...
  Using Package dependency System.Threading 4.0.0
    Source: /Users/joshuapearce/.dnx/packages/System.Threading/4.0.0

  Unable to resolve dependency fx/mscorlib 

  Unable to resolve dependency fx/System 

  Unable to resolve dependency fx/System.Core 

  Unable to resolve dependency fx/Microsoft.CSharp 

  Unable to resolve dependency fx/System.IO 

  Unable to resolve dependency fx/System.Security 

  Unable to resolve dependency fx/System.Xml 

  Unable to resolve dependency fx/System.Xml.Linq 

  Unable to resolve dependency fx/System.Runtime 

  Unable to resolve dependency fx/System.ComponentModel.DataAnnotations 

  Unable to resolve dependency fx/System.Collections 

  Unable to resolve dependency fx/System.Text.Encoding 

  Unable to resolve dependency fx/System.Threading.Tasks 

  Unable to resolve dependency fx/System.Collections.Concurrent 
  ...