Problem boot client, nfsmount: need a path

[Wim De Geeter]

Hi,
I am trying to setup and test a fai-server. I followed the instructions 
from http://www.informatik.uni-koeln.de/fai/fai-guide.pdf.
Now I try to boot my first client to test if dhcp and tftp is working.
I got the pxelinux.0 file from my faiserver.  Get all the info from my 
DHCP (ip, gateway, dns, ...) but is hanging than with:
nfsmount: need a path
I tested also nfs from another computer and I can mount /srv/fai/nfsroot 
and /srv/fai/config without problems.
Anyone an idea what I am missing
Many thanks