Adding LDAP user to multiple groups

[Golden Butler <golden@cnt.org>]

Hi,

I'm trying to add a user to multiple groups using an ldif file.  Here's how I'm attempting to do so:

dn: uid=user,ou=people,dc=example,dc=org
cn: User Man
gidNumber: 1000, 1004, 1010
objectClass: top
objectClass: posixAccount
objectClass: shadowAccount
objectClass: inetOrgPerson
sn: Man
uid: User
uidNumber: 1030

When I try to ldapadd this entry I get the following error:

adding new entry "uid=user,ou=people,dc=example,dc=org"
ldapadd: update failed: uid=user,ou=people,dc=example,dc=org
ldap_add: Invalid syntax (21)
        additional info: gidNumber: value #0 invalid per syntax

Am I doing something wrong here?  Thanks for any help in advance. 

- Delamatrix