On a debug site I would recommend uncommenting the following lines in the file settings.php.
nano sites/default/settings.php
if (file_exists(__DIR__ . '/settings.local.php')) {
include __DIR__ . '/settings.local.php';
}
In addition to adding the next setting:
$config = 'verbose';
It also adds a few other settings which will help you in debugging and making development easier. If you don't want...
