[SOLVED] No such file or directory in Drupal\Core\Asset\JsCollectionOptimizer (Flexslider) Drupal 8

No such file or directory in Drupal\Core\Asset\JsCollectionOptimizer (Flexslider) Drupal 8

I have a new Drupal 8 site installed and I'm trying to get the Flex Slider module to work. After installing it in /admin/reports/status there is the following error:

FlexSlider library not found. Please consult the README.md for installation instructions.

When going to the flexslider example pages, the images show but not in a slider. I get this error:

Warning: file_get_contents(libraries/flexslider/jquery.flexslider-min.js): 
failed to open stream: No such file or directory in Drupal\Core\Asset\JsCollectionOptimizer->optimize()
(line 127 of /var/www/html/web/core/lib/Drupal/Core/Asset/JsCollectionOptimizer.php)

I'm still a Drupal beginner and I'm not sure where to go next.

Solution

Please make sure you have followed all the steps from the Installation section on the Flex Slider project page. The error indicates that the Flex Slider library is missing from sites/all/libraries.