title: how to copy one class to another class in existing netbeans project?
body: <p>I'm new to Netbeans environment. I want to check the existing project code with different formulas. Each class have Jframes. if i right click the jframe and click refactor finally copy the file in another name. i get below message. 
  <a href="https://i.stack.imgur.com/rFmQS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rFmQS.png" alt="enter image description here"></a></p>
  
  <p>Please help me out this problem.</p>