Getting fatal error in drupal when open the site I am working on a site in which it was perfectly, but now its given this error


  Fatal error: require_once(): Failed opening required
  '/var/www/.../includes/sites/all/modules/context/plugins/context_condition_sitewide.inc'
  (include_path='.:') in /var/www/.../includes/bootstrap.inc on line
  3139.


Here we can see the path is changed .../includes/sites/..... where as the "include" and "sites" are on root folder.

So please guide me that how to solve this issue.
Install Context module using drush en "context".

Your site is not get /context_condition_sitewide.inc file or you may be accidently delete this module without disabling it from module list. Try reinstalling this module again.