HA fencing error when trying to activate

Hi,

i'm trying to set up a test cluster with 2 nodes in HA with fencing devices.
when i'm trying to active it at the HA tab i'm getting the follow error:

config validation failed: /usr/sbin/ccs_config_validate: line 186: 7159 Segmentation fault ccs_config_dump > $tempfile (500)

does anyone know how to solve this problem, i really can't find out what the problem is.

As fencing device we are using a APC switch AP7921

etc/pve/cluster.conf.new

<?xml version="1.0"?>
<cluster config_version="18" name="clustertest">
<cman expected_votes="1" keyfile="/var/lib/pve-cluster/corosync.authkey" two_node="1"/>
<fencedevices>
<fencedevice agent="fence_apc" name="apc" lanplus="1" ipaddr="192.168.1.60" login="domeinict" passwd="test123" power_wait="5"/>
</fencedevices>
<clusternodes>
<clusternode name="proxmox01" nodeid="1" votes="1"/>
<fence>
<method name="1">
<device name="apc"/>
</method>
</fence>
<clusternode name="proxmox02" nodeid="2" votes="1"/>
</clusternodes>
<rm>
<pvevm autostart="1" vmid="100"/>
</rm>
</cluster>