title: .net core project dependencies - yellow triangle
body: <p>My .Net Core project has a yellow triangle on dependencies, but when I open it up, none of the child entries have a yellow triangle.  When I hover over dependencies, I don't see any tooltip telling me what's wrong.  How can I check to see what is causing this yellow triangle to show up?</p>
  
  <p>I did what @oandreeeee suggested and increased the log level of my build and I noticed this:</p>
  
  <pre><code>C:\Program Files\dotnet\sdk\2.2.104\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.ConflictResolution.targets(41,5): message NETSDK1041: Encountered conflict between
  'Reference:C:\Users\dev\.nuget\packages\netstandard.library\2.0.3\build\netstandard2.0\ref\System.ComponentModel.Composition.dll' and 
  'Reference:C:\Users\dev\.nuget\packages\system.componentmodel.composition\4.5.0\ref\netstandard2.0\System.ComponentModel.Composition.dll'.  NETSDK1034: Choosing 
  'Reference:C:\Users\dev\.nuget\packages\system.componentmodel.composition\4.5.0\ref\netstandard2.0\System.ComponentModel.Composition.dll' because file version '4.6.26515.6' is greater than '4.6.26419.2'.
  </code></pre>
  
  <p>This is my .csproj file:</p>
  
  <pre><code>&lt;Project Sdk="Microsoft.NET.Sdk"&gt;
  
  &lt;PropertyGroup&gt;
      &lt;TargetFramework&gt;netstandard2.0&lt;/TargetFramework&gt;
  &lt;/PropertyGroup&gt;
  
  &lt;PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'"&gt;
      &lt;TreatWarningsAsErrors&gt;true&lt;/TreatWarningsAsErrors&gt;
      &lt;WarningsAsErrors /&gt;
  &lt;/PropertyGroup&gt;
  
  &lt;ItemGroup&gt;
      &lt;PackageReference Include="Microsoft.Windows.Compatibility" Version="2.0.1" /&gt;
      &lt;PackageReference Include="Newtonsoft.Json" Version="12.0.1" /&gt;
      &lt;PackageReference Include="System.Threading.Tasks.Dataflow" Version="4.9.0" /&gt;
  &lt;/ItemGroup&gt;
  
  &lt;/Project&gt;
  </code></pre>
  
  <p>Where is that reference to <code>System.ComponentModel.Composition.dll</code> coming from?</p>
  
  <p><a href="https://i.stack.imgur.com/u9afZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/u9afZ.png" alt="enter image description here"></a></p>