Drupal - Why doesn't 'drush cc all' work?

You need to rebuild cache with Drupal 8, rather than clear it:

drush cr

• Update Drush (at least Drush 8.0 is required for Drupal 8)
  See How to install drush 8 properly? or http://www.jpstacey.info/blog/2014-04-07/switching-between-drush-major-versions.
• Use drush cr instead of drush cc all

You can even try:

• drupal 7 :drush cache-clear all
• drupal 8 : drush cache-rebuild

Refer two articles you can have some more idea on clearing and rebuilding cache:

1. http://www.metaltoad.com/blog/drupal-8-first-impressions-back-end-developer

2. https://www.drupal.org/documentation/clearing-rebuilding-cache