WSOD and Drush cc all fail after deleting a view of a long-time-ago deleted module Background

Drupal 7.40 site, all is up2date, the site itself worked, until the last hour, just fine.

The problem

I once had a module named Flexslider and have deleted it 5 months ago. One of it's views and/or content types stayed alive and I've deleted it in the last hour; Since then there is a WSOD in my site and each time I try to flush all caches with Drush I get the following error about the impossibility to access a Flexslider file.

Any ideas why would that happen?

 



Image update for user - Les Lim:
Since I happen to know from WSOD afte uninstalling the Memcache module and deleting it&#39;s folder that you just stopped using Memcache, then I know that your Drupal site has just reverted back to using the database cache.

You probably had entries in your database cache from before you switched to Memcache in the first place.  Those really old database cache entries are now back in use.

You're trying to clear caches, which is absolutely the correct thing to do. However, there's a nasty bug in CTools that prevents you from clearing the cache if a particular CTools cache entry is broken: https://www.drupal.org/node/1775612

In this case, though, the manual fix is pretty simple. You need to truncate the cache table in your database. That should allow the cache to rebuild itself normally.