automount error when mapping users home directory on smb share

Hi folks. I hope someone can help me with this problem. I have a minimac running 10.4. It authenticates with a windows domain controller no problem but wont map the home directory comes up with error "the home folder for use xxxxxxx is not located in the usual place or cannot be accessed". I have looked in the logs and am recieving the following automount error
AUTOMOUNT cant mount on /private/network/servers/sfoserver1/home/:y06 invalid argument (22).
This message is a bit spurious and does not seem to pin point the problem.
Many thanks for your time if you are reading this and might have some advise.
Best regards

Pete