title: Magento 2: 1 exception(s): Exception #0 (ReflectionException)
body: <p>I installed a Magento extension called Mageplaza Productslider using a manual method (copy files to app/code). This didn't look to work, so I installed the extension using composer:</p>
  
  <pre><code>composer require mageplaza/magento-2-product-slider)
  php bin/magento setup:upgrade
  php bin/magento setup:static-content:deploy
  </code></pre>
  
  <p>I still couldn't see the extension on any page so I decided to uninstall. To do this I deleted the Mageplaza folder from app/code and ran the following code to uninstall the Mageplaza extension and core:</p>
  
  <pre><code>php bin/magento module:disable &lt;ExtensionProvider_ExtensionName&gt; --clear-static-content
  </code></pre>
  
  <p>I now have the following error on my Magento 2 product pages on the frontend and when I try to edit products in the admin panel.</p>
  
  <pre><code>1 exception(s):
  Exception #0 (ReflectionException): Class 
  Mageplaza\Productslider\Model\Slider\Source\FeaturedProducts does not exist
  
  Exception #0 (ReflectionException): Class 
  Mageplaza\Productslider\Model\Slider\Source\FeaturedProducts does not exist
  </code></pre>
  
  <p>To see full error, please see (if links aren't allowed please remove??):</p>
  
  <pre><code>https://www.canvaspro.com.au/horse-canvas.html
  </code></pre>
  
  <p>I have undertaken the following to attempt to fix the error:</p>
  
  <pre><code>rm -rf var/cache/* var/di/* var/generation/* var/page_cache/* var/view_preprocessed/* pub/static/frontend/* vendor
  
  composer install
  
  php bin/magento setup:di:compile
  </code></pre>
  
  <p>As I have deleted the var and vendor folders, how come after composer install Magento is still calling for these files under app/code?</p>
  
  <p>Thanks </p>