Unable to resolve the request "index.html".

Error on line 286 of /var/vhosts/hub.intrasonics.com/yii/web/CWebApplication.php

#0 /var/vhosts/hub.intrasonics.com/yii/web/CWebApplication.php(141): CWebApplication->runController('index.html')
#1 /var/vhosts/hub.intrasonics.com/yii/base/CApplication.php(184): CWebApplication->processRequest()
#2 /var/vhosts/www.intrasonics.com/public_html/enquiries/index.php(50): CApplication->run()
#3 {main}