I installed Drupal 8.5.6, in French. It seemed to work well, apart from no CSS working, but I corrected by unchecking CSS aggregation in the performance settings.

I decided to install some modules, one by one. Every time I install a module, after I click on the Install button, I get this.


After waiting more than 2 minutes (which is abnormal to me), I click on the Extend link to see if the module I am trying to install has been installed. The module seems to be installed, since it is checked, but it is not working.

So I uninstall that module, and try installing another module, but I get the same result.

Notice that the first modules I tried installing were the Coffee and Admin Toolbar modules. They get installed properly offline.

I have also noticed that using Drupal 8.2.5 everything is fine.

Is there any version problem, or am I doing something wrong?

I changed the PHP version using on the host to PHP 7.1.


After a few time doing something else, I went back to the issue. In fact a lot of JavaScript was not working correctly.

Then I decided to go back to Configuration -> Performance and unchecked JavaScript aggregator and saved that configuration. See the image below :

enter image description here

Now everything works fine!!!

Now I can use admin toolbar's dropdown menu as well as coffee and all the other stuff is working well.

And thank you for reading me.

  • This is only a work around. The cause of the error is that your Drupal installation is not able to create the aggregated CSS/JS files in sites/default/files/. The same happens for the translation files or the image styles in your follow up question drupal.stackexchange.com/questions/267401/no-image-is-showing – 4k4 Aug 12 '18 at 9:23

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