jos-Error: Application Instantiation Error

JFactory :: getApplication() @ /usr/home/alex/data/www/prarus.info/index.php:29
JApplication :: getInstance() @ /usr/home/alex/data/www/prarus.info/libraries/joomla/factory.php:102
JApplicationCms :: getInstance() @ /usr/home/alex/data/www/prarus.info/libraries/legacy/application/application.php:175
JApplicationSite -> __construct() @ /usr/home/alex/data/www/prarus.info/libraries/cms/application/cms.php:405
JApplicationCms -> __construct() @ /usr/home/alex/data/www/prarus.info/libraries/cms/application/site.php:63
JApplicationCms -> loadSession() @ /usr/home/alex/data/www/prarus.info/libraries/cms/application/cms.php:132
JApplicationWeb -> registerEvent() @ /usr/home/alex/data/www/prarus.info/libraries/cms/application/cms.php:744
JDispatcher -> register() @ /usr/home/alex/data/www/prarus.info/libraries/joomla/application/web.php:624
JError :: raiseWarning() @ /usr/home/alex/data/www/prarus.info/libraries/joomla/event/dispatcher.php:114
JError :: raise() @ /usr/home/alex/data/www/prarus.info/libraries/joomla/error/error.php:276
JError :: throwError() @ /usr/home/alex/data/www/prarus.info/libraries/joomla/error/error.php:176
call_user_func_array() @ /usr/home/alex/data/www/prarus.info/libraries/joomla/error/error.php:214
JError :: handleMessage()
JFactory :: getApplication() @ /usr/home/alex/data/www/prarus.info/libraries/joomla/error/error.php:705
JError :: raiseError() @ /usr/home/alex/data/www/prarus.info/libraries/joomla/factory.php:99
JError :: raise() @ /usr/home/alex/data/www/prarus.info/libraries/joomla/error/error.php:251