Error on OpenVZ container

Hello,
i have migrated a Virtualmin version: 4.11.gpl / webmin version: 1.710
on an OpenVZ container under Proxmox.

Now i have this error:
Undefined subroutine &proc::list_processes called at ./status-lib.pl line 250.

and

Changing PHP execution mode to FCGId (run as virtual server owner) …
… done
Applying web server configuration …
… failed! Undefined subroutine &proc::list_processes called at /usr/share/webmin/virtual-server/php-lib.pl line 1030.

Seem some problems with /proc/ partition under OpenVZ.

Please, someone have seen previusly this error ?

Thanks!