Unable to mount cfs

I have a three node cluster with a couple of shared filesystem. The cluster had a failover filesystem who was to be converted to a cfs. 

I have configured the clueter and imported the diskgroup and started the volume but the filesystem can't get mounted:

/opt/VRTS/bin/cfsmount /data/disk2 Server1
Mounting...
Error: V-35-50: Could not mount [/dev/vx/dsk/cl_disk2_dg/data_disk2_vol] at /data/disk2 on Server1
UX:vxfs mount.vxfs: ERROR: V-3-20: Protocol not supported
UX:vxfs mount.vxfs: ERROR: V-3-21256: cannot mount /dev/vx/dsk/cl_disk2_dg/data_disk2_vol

The other filesystems remain mounted but I cant get this filesystem mounted.

/opt/VRTS/bin/cfsdgadm display cl_disk2_dg
NODE NAME ACTIVATION MODE
Server1            sw
Server2            sw
Server3            sw

I can't find any information regarding this error. 

Regards

Markus