jos-Error: Application Instantiation Error

JFactory :: getApplication() @ /var/www/invertnet/index.php:29
JApplication :: getInstance() @ /var/www/invertnet/libraries/joomla/factory.php:102
JSite -> __construct() @ /var/www/invertnet/libraries/joomla/application/application.php:180
JApplication -> __construct() @ /var/www/invertnet/includes/application.php:47
JApplication -> _createSession() @ /var/www/invertnet/libraries/joomla/application/application.php:145
JFactory :: getSession() @ /var/www/invertnet/libraries/joomla/application/application.php:1020
JFactory :: createSession() @ /var/www/invertnet/libraries/joomla/factory.php:153
JSession :: getInstance() @ /var/www/invertnet/libraries/joomla/factory.php:657
JSession -> __construct() @ /var/www/invertnet/libraries/joomla/session/session.php:176
JSession -> _start() @ /var/www/invertnet/libraries/joomla/session/session.php:139
session_start() @ /var/www/invertnet/libraries/joomla/session/session.php:557
JSessionStorageDatabase -> read()
JFactory :: getDbo() @ /var/www/invertnet/libraries/joomla/session/storage/database.php:34
JFactory :: createDbo() @ /var/www/invertnet/libraries/joomla/factory.php:305
JDatabase :: getInstance() @ /var/www/invertnet/libraries/joomla/factory.php:706
JDatabaseMySQL -> __construct() @ /var/www/invertnet/libraries/joomla/database/database.php:328
JText :: _() @ /var/www/invertnet/libraries/joomla/database/database/mysql.php:103
JFactory :: getLanguage() @ /var/www/invertnet/libraries/joomla/methods.php:134
JFactory :: createLanguage() @ /var/www/invertnet/libraries/joomla/factory.php:173
JLanguage :: getInstance() @ /var/www/invertnet/libraries/joomla/factory.php:819
JLanguage -> __construct() @ /var/www/invertnet/libraries/joomla/language/language.php:275
JLanguage -> load() @ /var/www/invertnet/libraries/joomla/language/language.php:258
JFactory :: getApplication() @ /var/www/invertnet/libraries/joomla/language/language.php:767
JError :: raiseError() @ /var/www/invertnet/libraries/joomla/factory.php:99
JError :: raise() @ /var/www/invertnet/libraries/joomla/error/error.php:251
JError :: throwError() @ /var/www/invertnet/libraries/joomla/error/error.php:176
call_user_func_array() @ /var/www/invertnet/libraries/joomla/error/error.php:214
JError :: handleCallback()
call_user_func() @ /var/www/invertnet/libraries/joomla/error/error.php:765
JError :: customErrorPage()
JFactory :: getApplication() @ /var/www/invertnet/libraries/joomla/error/error.php:784
JError :: raiseError() @ /var/www/invertnet/libraries/joomla/factory.php:99
JError :: raise() @ /var/www/invertnet/libraries/joomla/error/error.php:251