RAID UNKNOWN

Hello,

I have imported this plugin on my EON server. After following the steps, I have this error :
RAID UNKNOWN – /usr/sbin/hpssacli did not execute properly : Error: No controllers detected. Possible causes: – The driver for the installed controller(s) is not loaded. – On LINUX, the scsi_generic (sg) driver module is not loaded. See the README file for more details.

I have check the sudoer/permission and everything seems to be fine. Anyone could kindly advise me ?