I can't access the modules page I have installed a few modules for the site; one of them is causing an error, and I can't access the modules page.

The error I see is the following one:


  Fatal error: Call to undefined function ctools_include() in
  /var/www/vhosts/haweraprezchurch.org.nz/httpdocs/sites/all/modules/features/includes/features.ctools.inc on line 226


How can I access the module page?

In my case I am using Drupal 7.
I always find the simplest way to deal with this is just to go to the system table in the site's database, and set the status column for the problematic module to 0.

After clearing the cache tables (either with Drush, or manually) you should be able to access the modules page again.