jos-Error: Application Instantiation Error

JFactory :: getApplication() @ /home/virtualphone/public_html/index.php:1060
JApplication :: getInstance() @ /home/virtualphone/public_html/libraries/joomla/factory.php:102
JSite -> __construct() @ /home/virtualphone/public_html/libraries/joomla/application/application.php:180
JApplication -> __construct() @ /home/virtualphone/public_html/includes/application.php:47
JApplication -> _createSession() @ /home/virtualphone/public_html/libraries/joomla/application/application.php:145
JApplication -> checkSession() @ /home/virtualphone/public_html/libraries/joomla/application/application.php:1044
JDatabaseMySQLi -> execute() @ /home/virtualphone/public_html/libraries/joomla/application/application.php:1101
JError :: raiseError() @ /home/virtualphone/public_html/libraries/joomla/database/database/mysqli.php:396
JError :: raise() @ /home/virtualphone/public_html/libraries/joomla/error/error.php:251
JError :: throwError() @ /home/virtualphone/public_html/libraries/joomla/error/error.php:176
JError :: handleCallback() @ /home/virtualphone/public_html/libraries/joomla/error/error.php:214
JError :: customErrorPage() @ /home/virtualphone/public_html/libraries/joomla/error/error.php:765
JFactory :: getApplication() @ /home/virtualphone/public_html/libraries/joomla/error/error.php:784
JError :: raiseError() @ /home/virtualphone/public_html/libraries/joomla/factory.php:99
JError :: raise() @ /home/virtualphone/public_html/libraries/joomla/error/error.php:251