title: How can I track down the cause of Android "found an invalid color" error
body: <p>During build of my android application I am getting the following error:</p>
  
  <pre><code>:app:mergeDev_testingDebugResources
  error: found an invalid color.
  </code></pre>
  
  <p>I don't get any line of code or even which file it is having a problem with. I have a large number of outstanding changes (stupid me) which I don't want to roll back - but I'm totally stumped as to how to work out what is wrong. </p>