Quota strange behavior

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I'm using Proxmox 2 (right now 2.1-14/f32f3f46) for about 7 months and since then I'm getting this error message at InitLog in one of my openVZ machines that uses quota:

quotaon: using //aquota.group on /dev/simfs [/]: Device or resource busy
quotaon: using //aquota.user on /dev/simfs [/]: Device or resource busy
startpar: service(s) returned failure: vzquota ... failed!

I realize that quota is working properly, so I don't know why I get this message, I searched in this forum and others but no luck, there are threads about this issue, but there is no concrete answer. Is this message normal or I have to do something else in order to get quota work as it would?

Best regard to all