DNU Unknown header recovery on OSX Yosemite

I've tried a couple of times to get .Net working on my MacBook using instructions found in the official Asp.Net docs and elsewhere. The last attempt was to use the Yeoman generator instructions found here .

However, when I try to run DNU Restore, I am always given the same error, albeit for a different library. The error is "unknown header:" followed by a number that differs depending on the library. Here's one example (only the first few and last few lines are included for brevity):

Error: DownloadPackageAsync: https://www.nuget.org/api/v2/package/Microsoft.AspNet.Loader.IIS/1.0.0-beta5
  Unknown header: 3649249205
----------
System.NotSupportedException: Unknown header: 3649249205
  at SharpCompress.Common.Zip.ZipHeaderFactory.ReadHeader (UInt32 headerBytes, System.IO.BinaryReader reader) [0x00000] in <filename unknown>:0
  at SharpCompress.Common.Zip.SeekableZipHeaderFactory+<ReadSeekableHeader>c__Iterator0.MoveNext () [0x00000] in <filename unknown>:0
  at SharpCompress.Archive.Zip.ZipArchive+<LoadEntries>c__Iterator0.MoveNext () [0x00000] in <filename unknown>:0
  at SharpCompress.LazyReadOnlyCollection`1+LazyLoader[SharpCompress.Archive.Zip.ZipArchiveEntry].MoveNext () [0x00000] in <filename unknown>:0
  at System.IO.Compression.ZipArchive.CreateZip (System.IO.Stream stream, ZipArchiveMode mode) [0x00000] in <filename unknown>:0
  at System.IO.Compression.ZipArchive..ctor (System.IO.Stream stream, ZipArchiveMode mode, Boolean leaveOpen) [0x00000] in <filename unknown>:0
  at Microsoft.Framework.PackageManager.Restore.NuGet.PackageUtilities.EnsureValidPackageContents (System.IO.Stream stream, Microsoft.Framework.PackageManager.PackageInfo package) [0x00000] in <filename unknown>:0
  at Microsoft.Framework.PackageManager.Restore.NuGet.PackageUtilities+<>c__DisplayClass1_0.<OpenNupkgStreamAsync>b__0 (System.IO.Stream stream) [0x00000] in <filename unknown>:0
  at Microsoft.Framework.PackageManager.Restore.NuGet.HttpSource+<GetAsync>d__8.MoveNext () [0x00000] in <filename unknown>:0
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x00000] in <filename unknown>:0
  at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in <filename unknown>:0
  at Microsoft.Framework.PackageManager.Restore.NuGet.PackageUtilities+<OpenNupkgStreamAsync>d__1.MoveNext () [0x00000] in <filename unknown>:0

...

Restore failed
Unknown header: 3649249205

NuGet Config files used:
    /Users/jamie.morris/.config/NuGet/NuGet.Config

Feeds used:
    https://www.myget.org/F/aspnetvnext/api/v2/
    https://nuget.org/api/v2/

      

        
        
        
      

    

I tried deleting the contents of ~ / .dnx / packages and removing old dnx versions from ~ / .dnx / runtimes. I am currently using 1.0.0-beta6-12170

runtime.

Has anyone else had a similar problem or figured out how to fix it?

EDIT:

Here's the result dnvm list

:

Active Version              Runtime Arch Location             Alias
------ -------              ------- ---- --------             -----
  *    1.0.0-beta6-12170    mono         ~/.dnx/runtimes      default

      

        
        
        
      

    

Here's the result mono --version

:

Mono JIT compiler version 3.12.1 (tarball Tue Mar 17 15:03:14 GMT 2015)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
    TLS:           normal
    SIGSEGV:       altstack
    Notification:  kqueue
    Architecture:  amd64
    Disabled:      none
    Misc:          softdebug
    LLVM:          supported, not enabled.
    GC:            sgen