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I've installed a premium theme in a Drupal 8.1.0, and now each time I log into the site It crashes with the error "An unknown error has occurred" (even though the site itself works fine). I thus try to change it with Drush.

I've tried drush vset bartik in drush-master to change the non-admin theme back to bartik in Drupal 8 but then came the error:

[error]Command variable-set requires Drupal core version 6 or 7 to run.
[error] The drush command 'vset bartik' could not be executed.

18

Try this:

drush config-set system.theme default bartik
  • You might need to clear or rebuild your CSS/JS and theme caches (drush cr).

  • If the problem still appears, check that it has not been forced in your settings.php file.

Source: https://www.drupal.org/node/200774

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    It is not working in 8.4.0. i do not get any error code. In settings php is nothing to find – Justme Oct 23 '17 at 8:17
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    To reset admin theme use: drush config-set system.theme admin seven – Dimetry Jan 10 '19 at 7:25
  • How to get the theme list as theme-list did it on D6 ? – webmaster pf Feb 11 '19 at 16:20
  • @webmasterpf You should post a new question for this (if one does not already exist), cheers! – Stefanos Petrakis Feb 12 '19 at 10:15
  • I know but I can't post new question for the moment, system ban me. – webmaster pf Feb 13 '19 at 9:02

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