Getting below fatal error when I try to install the Administration menu module in D8.

Fatal error: Cannot instantiate interface Drupal\Core\Cache\CacheBackendInterface.


Yash Khandelwal created an issue.

Znak’s picture

This module have problem with this error and variables, because if I uninstall this module I have problem with variable_get() function.

deepuchowdary07’s picture

just now I installed drupal8 but below error is displaying.

Fatal error: Cannot instantiate interface Drupal\Core\Cache\CacheBackendInterface in C:\wamp\www\drupal8\core\lib\Drupal\Component\DependencyInjection\Container.php on line 268

May i know the solution for this?

frederico’s picture

I had to delete the module via FTP and then flush the cache using a Drush command. It then removed the dreaded "White Screen of Death" issue. But reinstalling it breaks it again. I'm still looking for a solution but hopefully this will help someone at least get their website back up and running quickly.

frederico’s picture

Actually, I found a MUCH better answer to your question than mine. Go to Taekyon gives a great step-by-step recovery procedure for your problem.