title: "/usr/lib/mono/msbuild/15.0/bin/Roslyn/Microsoft.CSharp.Core.targets" was not found in monoDevelop IDE on kali linux 2020
body: <p>I am new to c# programming and specially new to mono compiler and mono related things on linux. when i wrote</p>
  
  <pre><code>using System;
  
  namespace HelloWorld
  {
      class MainClass
      {
          public static void Main(string[] args)
          {
              Console.WriteLine("Hello World!");
          }
      }
  }
  </code></pre>
  
  <p>on mono develop IDE and hit the build button i am getting </p>
  
  <pre><code>/usr/lib/mono/msbuild/15.0/bin/Microsoft.CSharp.CurrentVersion.targets(5,5): Error MSB4019: The imported project 
  "/usr/lib/mono/msbuild/15.0/bin/Roslyn/Microsoft.CSharp.Core.targets" was not found. 
  Confirm that the path in the &lt;Import&gt; declaration is correct, and that the file exists on disk. (MSB4019) (HelloWorld)
  </code></pre>
  
  <p>this error. i did some research i can't understand any solution because i am completely beginner to mono c# programming on linux</p>