title: Could not load file or assembly "System.ValueTuple, Version=0.0.0.0" or one of its dependencies
body: <p>I tried to update my project to .NET Standard 2.0 and during testing I got catch an exception:</p>
  
  <blockquote>
    <p>System.IO.FileLoadException: 'Could not load file or assembly "System.ValueTuple, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51" or one of its dependencies. The definition of the assembly manifest found does not match the reference to the assembly.</p>
  </blockquote>
  
  <p>This is assambly exists in package.config
  <em></em>
  and exists on the package's folder. I tried some versions of System.ValueTuple package, result is one.</p>
  
  <p>Why the version of dependencies «0.0.0.0»?</p>
  
  <p>Does anyone have an idea about the problem?</p>
  
  <p>VS 2017 Preview, UnitTestApp, .NET Framework 4.7.</p>
  
  <p>In the unit test app I create EF model (Microsoft.EntityFrameworkCore, Microsoft.EntityFrameworkCore.SqlServer 2.0.0-preview2-final, it needs in .NET Standard app).
  The Unit test method - insert into table some rows using EF db model, and call 'savechanges', after that throw this exception.</p>
  
  <p>When I used EntityFrameworkCore 1.1.2 (dll with EF model - Standard 1.4, unit test Framework 4.6.2) - this test worked well.</p>