afp_mount problem

I have a script that does an afp_mount of a volume for users. I have one user (of whom I am aware) that gets an errno 2 when trying to mount that volume. The odd part is that I can mount the volume using Finder connect with the same username and password. I am sure it is not a security issue but I cannot find what is different with this user then from those that work. Does anyone have any suggestions what this error is and how to go about shooting this bug? TIA.