VPlex Monitor Collect Command Not Working

Hi Team,

I tried CLI command to get performance data for a director as shown below
VPlexcli:/> monitor collect /monitoring/directors/director-2-1-B/monitors/director-2-1-B_TestMonitor
but it neither gives me error nor expected result.
as per the administrator document the output should be the following

VPlexcli:/>

Source: director-2-1-B_TestMonitor

Time: 2010-07-01 10:05:55

director.be-ops (counts/s):

.

.

.I checked polling time and it is 10 sec.
Please help me with your valuable response.