title: CKEditor Plugin giving errors 'Uncaught TypeError: Cannot read property 'icons' of null'
body: <p>I am just starting with CKEditor (latest version 4.5.7) using the cdn, wanting to use the plugin:</p>
  
  <pre><code>http://ckeditor.com/addon/uploadimage
  </code></pre>
  
  <p>I have downloaded and extracted the files of that plugin to 'myplugins/uploadImage/'.</p>
  
  <pre><code>                &lt;textarea name="editor1"&gt;&lt;/textarea&gt;
                  &lt;script&gt;
                      CKEDITOR.plugins.addExternal( 'uploadImage', '/myplugins/uploadImage/', 'plugin.js' );
                      CKEDITOR.replace( 'editor1', {
                           extraPlugins: 'uploadImage'
                      } );                        
                  &lt;/script&gt;               
  </code></pre>
  
  <p>CKEditor works without any plugins, but when I do the above to add the 'uploadImage' plugin, I am getting the following error in chrome console:</p>
  
  <p>'Uncaught TypeError: Cannot read property 'icons' of null'</p>
  
  <p>What is it that I am missing?</p>