Cron.php not sending scheduled mails

In Joomla, run cron.php through url and also with job-specific parameter(process_mailing) gave following notices and scheduled mails are not sent.

Notice: Use of undefined constant JPATH_SITE - assumed 'JPATH_SITE' in /libraries/joomla/filesystem/path.php on line 27

Notice: Undefined variable: limit in /administrator/components/com_civicrm/civicrm/CRM/Utils/System/Joomla.php on line 449

Notice: Use of undefined constant JPATH_CACHE - assumed 'JPATH_CACHE' in /libraries/joomla/cache/cache.php on line 53

Notice: Use of undefined constant JPATH_CACHE - assumed 'JPATH_CACHE' in /libraries/joomla/cache/cache.php on line 53

Notice: Use of undefined constant JPATH_SITE - assumed 'JPATH_SITE' in /libraries/joomla/application/helper.php on line 91

Notice: Use of undefined constant JPATH_ADMINISTRATOR - assumed 'JPATH_ADMINISTRATOR' in /libraries/joomla/application/helper.php on line 97

Notice: Use of undefined constant JPATH_INSTALLATION - assumed 'JPATH_INSTALLATION' in /libraries/joomla/application/helper.php on line 103

Notice: Trying to get property of non-object in /libraries/joomla/application/application.php on line 201

Notice: Use of undefined constant JPATH_BASE - assumed 'JPATH_BASE' in /libraries/joomla/language/language.php on line 1164

Notice: Use of undefined constant JPATH_BASE - assumed 'JPATH_BASE' in /libraries/joomla/language/language.php on line 177

Notice: Use of undefined constant JPATH_BASE - assumed 'JPATH_BASE' in /libraries/joomla/language/language.php on line 715

I also checked with Enableing "Send Scheduled Mailings" job under Administer >> System Settings >> Scheduled Jobs but it not works.
All the conditions are worked with drupal.