title: "A configuration with this name already exists" error in eclipse run configurations
body: <p>I synced mercurial project, and tried to setup run configurations.</p>
  
  <p><img src="https://i.stack.imgur.com/BPRAL.png" alt="enter image description here"></p>
  
  <p>I found the name has <code>(1)</code> attached, and I tried to remove it.</p>
  
  <p><img src="https://i.stack.imgur.com/AIDtx.png" alt="enter image description here"></p>
  
  <p>However, I got <code>A configuration with this name already exists</code> error. I checked other configurations, but there was no duplication of Name <code>Equivalence Checker</code>.</p>
  
  <p><img src="https://i.stack.imgur.com/e1YLE.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/NVP7z.png" alt="enter image description here"></p>
  
  <p>How can I find the existing configuration to remove it?</p>