title: Could not find main method from given launch configuration
body: <p>I created a Java Program with many JFrames using Eclipse IDE.</p>
  
  <p>So when I wanted to create an executable jar file for my project I got this error:</p>
  
  <pre><code>Could not find main method from given launch configuration
  </code></pre>
  
  <p>And even when I specified the main Class in the project properties, I'm still having the error.</p>
  
  <p>Thanks in advance</p>