jos-Error: Application Instantiation Error

JFactory :: getApplication() @ /data/www/shop.venturesbooks.cz/public_html/index.php:27
JApplication :: getInstance() @ /data/www/shop.venturesbooks.cz/public_html/libraries/joomla/factory.php:102
JError :: raiseError() @ /data/www/shop.venturesbooks.cz/public_html/libraries/joomla/application/application.php:184
JError :: raise() @ /data/www/shop.venturesbooks.cz/public_html/libraries/joomla/error/error.php:251
JError :: throwError() @ /data/www/shop.venturesbooks.cz/public_html/libraries/joomla/error/error.php:176
call_user_func_array() @ /data/www/shop.venturesbooks.cz/public_html/libraries/joomla/error/error.php:214
JError :: handleCallback()
call_user_func() @ /data/www/shop.venturesbooks.cz/public_html/libraries/joomla/error/error.php:765
JError :: customErrorPage()
JFactory :: getApplication() @ /data/www/shop.venturesbooks.cz/public_html/libraries/joomla/error/error.php:784
JError :: raiseError() @ /data/www/shop.venturesbooks.cz/public_html/libraries/joomla/factory.php:99
JError :: raise() @ /data/www/shop.venturesbooks.cz/public_html/libraries/joomla/error/error.php:251