Error: Unknown Namespace software

Hi Guys,

I was trying to remove a VEM (Cisco Nexus 1000v component)  from one of the ESXi 4.1 host using the following command:

esxcli software vib remove -n cisco-vem-v140-esx --maintenance-mode

but kept getting the following error:

Errors:

Unknown Namespace software

I can confirm that the command is correct.

Can anyone guide me on how to fix it?

Thanks in advance!

K