Proxmox 3.0 Cluster Setup problem

[hoyin630]

Hi All,

I have 5 new server installed Proxmox 3.0
I follow http://pve.proxmox.com/wiki/Proxmox_VE_2.0_Cluster
to create a cluster, I want to add a not with

pvecm add IP_ADDRESS

it show
authentication key already exists
if I try

pvecm add IP_ADDRESS -force

it show


I/O warning : failed to load external entity "/etc/pve/cluster.conf"
ccs_tool: Error: unable to parse requested configuration file

command 'ccs_tool lsnode -c /etc/pve/cluster.conf' failed: exit code 1
unable to add node: command failed (ssh IP_ADDRESS -o BatchMode=yes pvecm addnode vm01 --force 1)

Plese help
Thanks a lot