title: How to Diagnose CarrierWave "undefined method `scale' for #<ImageUploader:..."
body: <p>I'm attempting to use CarrierWave with RMagick, but when I attempt to do any image manipulation (such as scale), I get undefined errors. (rails 4.0, ruby 2.0)</p>
  
  <pre><code>version :thumb do
      process :scale =&gt; [50, 50]
  end
  </code></pre>
  
  <p>leads to...
      undefined method `scale' for #</p>
  
  <p>I know I have imagemagick installed properly on my machine because I can run mogrify from the CLI.</p>
  
  <p>Any ideas on how to diagnose the problem? I've tried many SO "solutions" with no luck</p>
  
  <p>Thanks!</p>
  
  <p><strong>EDIT</strong>
  I didn't find any reasonable solution to CarrierWave. Rather, it seems my ImageMagick install was somehow bad. Although it worked fine on the CLI, RMagick couldn't communicate properly. A clean reinstall of ImageMagick fixed it.</p>