jos-Error: Application Instantiation Error

JFactory :: getApplication() @ /var/www/vhosts/39866523.servicio-online.net/zeventos.es/index.php:27
JApplication :: getInstance() @ /var/www/vhosts/39866523.servicio-online.net/zeventos.es/libraries/joomla/factory.php:102
JError :: raiseError() @ /var/www/vhosts/39866523.servicio-online.net/zeventos.es/libraries/joomla/application/application.php:184
JError :: raise() @ /var/www/vhosts/39866523.servicio-online.net/zeventos.es/libraries/joomla/error/error.php:251
JError :: throwError() @ /var/www/vhosts/39866523.servicio-online.net/zeventos.es/libraries/joomla/error/error.php:176
JError :: handleCallback() @ /var/www/vhosts/39866523.servicio-online.net/zeventos.es/libraries/joomla/error/error.php:214
JError :: customErrorPage() @ /var/www/vhosts/39866523.servicio-online.net/zeventos.es/libraries/joomla/error/error.php:765
JFactory :: getApplication() @ /var/www/vhosts/39866523.servicio-online.net/zeventos.es/libraries/joomla/error/error.php:784
JError :: raiseError() @ /var/www/vhosts/39866523.servicio-online.net/zeventos.es/libraries/joomla/factory.php:99
JError :: raise() @ /var/www/vhosts/39866523.servicio-online.net/zeventos.es/libraries/joomla/error/error.php:251