ssh login LDAP problem

Hi,
I'm new to ssh. I'm having problems with authentication - here goes...

I have OpenSSH_4.1p1 and OpenSSL 0.9.7g on a Solaris 8 machine. I have
put entries in the PAM.conf file for services to use the LDAP pam module
for authentication. I have also set the usePAM option in the sshd
configuration file to yes.
I can login to the machine with ssh using a NIS account but I can't
login using an account on an LDAP server.
I get the following error in the messages file:
 # Nov 29 17:40:59 nmsstases11 sshd[9507]: [ID 800047 auth.crit] fatal:
login_get_lastlog: Cannot find account for uid 45000
The uid of 45000 is correct.
Can anyone help?
Thanks,
Stuart