Problem with LXC

Hi,

I would like to user LXC so I install Cloudmin Pro 7.4 on CentOS 6. When I try to register LXC this error is show:

Failed to save LXC host : The selected system cannot support LXC containers : The /cgroup filesystem is not mounted

but /cgroup is mount:

mount

none on /cgroup type cgroup (rw)

fstab

none /cgroup cgroup defaults 0 0

Can you help me?
Thanks