I've seen this error before. My appserver was linux and we had the 'patch' directory shared out via nfs from a netapp. I had to turn on the linux 'nfslock' service on the appserver, and set it to start on boot.
Thank you, Bill. I looked around and found, that on SLES10 SP2 there is no 'nfslock'-service. Instead the lockd-funcionality is provided by a kernel-module, which in fact is loaded. Do you have any more ideas how to solve this problem?
Henning gave me the right option to use for kernel-based-nfs-services:
I have to mount the NFS-share with the option 'nolock'.