Sunday, April 10, 2016

Drupal 8 - Unable to install Devel, already exists in active configuration.

To protect and to serve....
Well life is shit sometimes.
I migrated a Drupal 6 site to Drupal 8.
All I wanted is to install devel and then develop like mad.
But  Devel won't install. It says:
Unable to install Devel, already exists in active configuration.
Diving into Drupal 8 I solved it, but I must honestly tell you that I do not really understand all consequences. It has something to do with the dependencies. The old site had Devel running, so maybe that caused the problem....

Solution (providing you have drush installed)
Open terminal and navigate to the root folder of your website
$ drush php
Wait till the drush php prompt (>>>) appears
push enter
some message appears like => Drupal\Core\Config\Config {#8157}

After that I had no problem installing Devel (and develop like hell....)


  1. Wow thank you. That worked for me. I've been searching and searching. I had no idea how to figure that out. (unfortunately I don't understand what that did either)

  2. Thank for your solution,
    will fix to "Unable to install Devel, devel.settings already exists in active configuration."

  3. Thank you! This worked for me as well!

  4. I was wondering how to launch drupal php from terminal. thnx, this helped

  5. I fixed this using

  6. Just want to say that I have this bookmarked and wind up coming back to it every few months for that one annoying site that just won't behave... so thanks!