jos-Error: Application Instantiation Error

JFactory :: getApplication() @ /var/www/vhosts/staging.bestloved.com/index.php:28
JApplication :: getInstance() @ /var/www/vhosts/staging.bestloved.com/libraries/joomla/factory.php:102
JError :: raiseError() @ /var/www/vhosts/staging.bestloved.com/libraries/joomla/application/application.php:184
JError :: raise() @ /var/www/vhosts/staging.bestloved.com/libraries/joomla/error/error.php:251
JError :: throwError() @ /var/www/vhosts/staging.bestloved.com/libraries/joomla/error/error.php:176
call_user_func_array() @ /var/www/vhosts/staging.bestloved.com/libraries/joomla/error/error.php:214
JError :: handleMessage()
JFactory :: getApplication() @ /var/www/vhosts/staging.bestloved.com/libraries/joomla/error/error.php:705
JError :: raiseError() @ /var/www/vhosts/staging.bestloved.com/libraries/joomla/factory.php:99
JError :: raise() @ /var/www/vhosts/staging.bestloved.com/libraries/joomla/error/error.php:251