title: Fix for the "The following theme is missing from the file system" error in Drupal 7
body: <p>I keep getting this same error from bugsnag for my site, and I'm unsure how to fix it/why it's popping up in the first place.</p>
  <pre><code>User Warning · The following theme is missing from the file system: &lt;em class=&quot;placeholder&quot;&gt;Theme_Name&lt;/em&gt;. For information about how to fix this, see &lt;a href=&quot;https://www.drupal.org/node/2487215&quot;&gt;the documentation page&lt;/a&gt;.
  </code></pre>
  <p>The theme that it claims it is missing is the only theme I have for the site and is the one it is currently using. Besides overloading my bugsnag reporting, it's not causing any issues. Is there a way to resolve this? I checked the documentation page and all the articles I found only refer to modules.</p>