title: Launch configuration references non-existing project
body: <pre><code>Launch configuration TestPanel references non-existing project NLDoc.
  </code></pre>
  
  <p>I installed latest Eclipse on Ubuntu, and import a Maven project. Building the project is fine. However, when in Eclipse I click "Run as->TestPanel", I received the above error.</p>
  
  <p>I did some search and tried the following solution:</p>
  
  <pre><code>Project properties -&gt; run/debug settings -&gt; New -&gt; Java Application
  </code></pre>
  
  <p>And then select my project name, and the main class, but it still not solving the project.</p>
  
  <p>What could be other causes? I am using Oracle JDK8</p>
  
  <p>EDIT:</p>
  
  <p>Unfortunately, this is not a duplication, since i import my project as a Maven project, so it's already a Java project. Also, when I click "project properties" and followed the steps, I also verified it's a Java project.</p>
  
  <p>So, it seems a similar problem but different causes.And this is exactly what I am asking. Hopefully somebody else encountered the same issue. </p>