title: How do I uninstall this buildpack in Heroku?
body: <p>I installed <a href="https://github.com/iphoting/heroku-buildpack-php-tyler" rel="noreferrer"><code>heroku-buildpack-php-tyler</code></a> on my Heroku app a few days ago, and it all seemed to work fine. I installed it by running the following command:</p>
  <pre><code>heroku config:set BUILDPACK_URL=git://github.com/iphoting/heroku-buildpack-php-tyler.git
  </code></pre>
  <p>However I now want to remove it. I tried using the following command:</p>
  <pre><code>heroku config:unset BUILDPACK_URL=git://github.com/iphoting/heroku-buildpack-php-tyler.git
  </code></pre>
  <p>But it returns the following error message:</p>
  <blockquote>
  <p>Unsetting BUILDPACK_URL=git://github.com/iphoting/heroku-buildpack-php-tyler.git and restarting hnf-heroku... failed</p>
  <p>!    Resource not found`</p>
  </blockquote>
  <p>Because PHP isn't officially supported by Heroku, there's not much documentation about this. So how do I uninstall this buildpack?</p>