title: why intellij new configuration button disabled?
body: <p>I want to add a new setting but the + button is disabled.
  I do not know why.
  Help.</p>
  
  <p><a href="https://i.stack.imgur.com/RMGk6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RMGk6.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/ekwAk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ekwAk.png" alt="enter image description here"></a></p>
  
  <p>=====update======</p>
  
  <p>I was deleted IDE and IDE configuration files and reinstall IDE. It works well.. Maybe it is my mistake.
  this is IDE configuration file path</p>
  
  <pre><code>~/Library/Preferences/com.jetbrains.intellij.plist
  ~/Library/Preferences/com.jetbrains.intellij.plist.lockfile
  ~/Library/Preferences/IntelliJIdea11
  ~/Library/Caches/IntelliJIdea11
  ~/Library/Application Support/IntelliJIdea11
  ~/Library/Caches/com.jetbrains.intellij
  ~/Library/Logs/IntelliJIdea11
  ~/Library/Saved Application State/com.jetbrains.intellij.savedState
  </code></pre>