thank you for your reply
I tried the same command as root and here is the result
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[root@node016 one]# virsh -c one:///
Welcome to virsh, the virtualization interactive terminal.
Type: 'help' for help with commands
'quit' to quit
virsh # list
Id Name State
----------------------------------
virsh #
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and I verify that there are virtual machines running under opennebula and here is the result
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[root@node016 one]# onevm list
ID USER NAME STAT CPU MEM HOSTNAME TIME
6 oneadmin test_kvm runn 0 524288 node015 03 00:55:57
21 oneadmin test_kvm runn 0 524288 node013 02 16:46:29
[root@node016 one]#
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Regards