Configuring OpenVas on BackTrack 5 R3

BackTrack is a pentest linux distribution, download live cd from here, it contains the open source security scanner OpenVAS.
Below are the configuration steps required after booting BackTrack 5 R3 to get OpenVAS running.

ERROR: The number of NVTs in the OpenVAS Manager database is too low

I was setting up OpenVas on BackTrack 5 R3 and got stuck at his error.

ERROR: The number of NVTs in the OpenVAS Manager database is too low