title: How to fix Eclipse IDE Run Configuration (Problem occurred dialog)
body: <p>I use Eclipse IDE(Spring Tool Suite) for many years, and periodically I have the same problem with the Launching project</p>
  <p>The problem happens with the existing &quot;Run Configuration&quot; after time, maybe after the IDE update, but I unable to reproduce why this happens. To quick fix, I just remove &quot;Run Configuration&quot; with error, and just &quot;mouse right-click on Application.java -&gt; Run As -&gt; Spring Boot App&quot; and all work, but I need again add environment variables to this new configuration ... etc</p>
  <p>I bored to have this problem for many years repeatedly from time to time.
  I think other Eclipse or Spring STS users have the same problem/experience.</p>
  <p>Does anyone know how to fix this error?
  Except Delete and Create again &quot;Run Configuration&quot;...</p>
  <p><a href="https://i.stack.imgur.com/nJg2q.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nJg2q.png" alt="enter image description here" /></a></p>
  <p>Problem Occurred</p>
  <pre><code>An internal error occurred during: &quot;Launching Operational&quot;.
  Cannot invoke &quot;org.eclipse.jdt.core.IJavaProject.getProject()&quot; because &quot;project&quot; is null
  </code></pre>
  <p><a href="https://i.stack.imgur.com/eVCjb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eVCjb.png" alt="enter image description here" /></a></p>
  <pre><code>An error has occurred. See error log for more details.
  Cannot invoke &quot;org.eclipse.jdt.core.IJavaProject.getProject()&quot; because &quot;project&quot; is null
  </code></pre>