title: Wordpress plugin Invalid header error
body: <p>I am working on a <code>Wordpress</code> site hosted by <code>Parallels</code> and uploaded via the plex panel.</p>
  
  <p>When I am installing a new <code>plugin</code>, first, I am notified that the <code>plugin</code> has been successfully installed.</p>
  
  <p>But when I click on <code>Activate</code>, I get an error message saying:</p>
  
  <pre><code>"The plugin does not have a valid header."
  </code></pre>
  
  <p>I am not sure what is causing this error, and it does on every <code>Wordpress plugin</code> that I try to install.</p>
  
  <p>When I try to upload the plugin manually by browsing for a folder and clicking upload, I get a different error message:</p>
  
  <pre><code>"Unable to create directory wp-content/uploads/2013/12. Is its parent directory writable by the server?"
  </code></pre>
  
  <p>These two errors are really puzzling and neither myself or my client can install any plugins.</p>
  
  <p><strong>P.s.  The above features work fine on the local server - it is just the development server that I am having issues.</strong></p>