title: Nuget pack won't install
body: <p>I am having problems install some Elmah packages in my project(if I make a new solution these packages work)</p>
  
  <pre><code>Attempting to resolve dependency 'elmah (= 1.2.0.1)'.
  Attempting to resolve dependency 'elmah.corelibrary (= 1.2)'.
  Successfully installed 'elmah.corelibrary 1.2.1'.
  Successfully installed 'elmah 1.2.0.1'.
  Successfully installed 'Elmah.MVC 1.3.2'.
  Successfully added 'elmah.corelibrary 1.2.1' to WebUIProject.
  Data at the root level is invalid. Line 1, position 1.
  Successfully uninstalled 'elmah 1.2.0.1'.
  Successfully uninstalled 'elmah.corelibrary 1.2.1'.
  Install failed. Rolling back...
  Data at the root level is invalid. Line 1, position 1.
  </code></pre>
  
  <p>anyone seen this before? I have version 1.6 for nuget.</p>