[PVE-User] Can not find file quota on / [/ dev / loop0] to turn quotas on / off

[karel.gonzalez]

I'm trying to enable disk quotas on a lxc in Proxmox 4.2 I've tried 
everything on the disk options enable quotas and acls but just can not 
get to make them work gives me an error when I try to enable quotas with 
have any idea of something I might be missing some configuration file in 
the Proxmox appreciate any help graciasss
sldss
karel

root at SalvaFocsa:~# quotaon -a
quotaon: Cannot find quota file on / [/dev/loop0] to turn quotas on/off.
quotaon: Cannot find quota file on / [/dev/loop0] to turn quotas on/off.
root at SalvaFocsa:~#