title: The version of Microsoft.NET.Sdk used by this project is insufficient to support references to libraries targeting .NET Standard 1.5 or higher
body: <p>Im am encountering the following build error:</p>
  
  <blockquote>
    <p>The version of Microsoft.NET.Sdk used by this project is insufficient to support references to libraries targeting .NET Standard 1.5 or higher.  Please install version 2.0 or higher of the .NET Core SDK.</p>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/duFco.png" alt="enter image description here"></p>
  
  <p>Whenever I'm rebuilding a solution, this error will show. Has anybody a clue how to solve this? I'm sure I've installed Visual Studio 2017 (15.3.2) and .NET Core 2.0 properly.</p>
  
  <p><img src="https://i.stack.imgur.com/AB38t.png" alt="enter image description here"></p>