When I try to install the Adaptive Theme for Drupal 8 on https://simplytest.me/, I get the following error on /core/autorize.php.

drupal 8.2.0-rc1
Update manager
Error message
Installation failed! See the log below for more information.


Error installing/updating
File Transfer failed, reason: Cannot copy /home/r1rkn/www/tmp/update-extraction-3b2e9e06/adaptivetheme/Gemfile.lock to /home/r1rkn/www/themes/adaptivetheme/Gemfile.lock.

This is for the latest Drupal 8 development snapshot version.

How can I fix this error?

  • Can you not install it on your machine or server?
    – Kevin
    Sep 18, 2016 at 16:03
  • Same thing, showing as installing on localhost, no error displayed, but not installed Sep 19, 2016 at 0:10
  • I also extracted the file physically in the themes folder, not showing up Sep 19, 2016 at 0:18

1 Answer 1


First thing is you don't install it.

All you have to do is make sure adaptivetheme is somewhere in the /themes/ directory.

Then download and install the AT Tools module and it's AT Theme Generator sub-module, then create a sub-theme via the UI (a tab in the Appearance section). The at_core base theme will install automatically when you enable your sub-theme.

Also, this theme will never show up on the Appearance page, it's hidden deliberately, because it's just a collection of scripts and libraries that support features in sub-themes. It's never intended to be interacted with via a UI, or be set as default etc.

  • Thank you, and I can see that installation instructions are on the bottom...it would be nice if they put in red or bold right at the top (THIS IS NOT A STANDARD THEME -- Read instructions below)...I mean, it is called A THEME after all...how can a user know? Drupal is made of modules, themes and libraries...! I simply followed standard backend GUI theme procedure..! Sep 19, 2016 at 9:13
  • A user would know by reading the documentation, which is a standard practice for any theme, module or profile. There is no such thing as a "standard theme", just as there is no such thing as a "standard module".
    – Jeff Burnz
    Sep 20, 2016 at 0:06

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