Settings

To set Drupal System variables you can use the $settings (on Drupal 8) and $conf (On Drupal 7) array of setting.php file.

Examples.

On Drupal 8

$settings['file_public_path'] = '/path/to/dir/public';

Compilers

1. COMPASS

Compass is a powerfull command line compiler

Install (Linux debian) : sudo apt-get install ruby-compass

Link : http://compass-style.org/help/documentation/command-line/

2. Koala

1. Define route in module.routing.yml
Exemple :
module.view.settings:
  path: '/url/to/the/page'
  defaults:
    _controller: '\Drupal\module\Controller\Demo::view'
    _title: ''
  requirements:


This is due to file/folder permission. so drupal cant write twig tempory files.

Change folder owner / permission like:
chown DRUPAL:www-data -R files/* (On debian/Ubuntu)
chown DRUPAL:apache -R files/* (On Redhat/CentOD/Fedors)

Comments are set as a field, so by default it is not present. To add comment field Goto:

Admin -> Structure -> Content types ->"YOUR CONTENT"
  ->Manage fields->Add field
  ->Select 'Comments' on 'Re-use an existing field' and Save.