In Solaris, users must belong to at least one group, called the primary group for each user.

Because of error or oversight, no groups are available to choose and this user is assigned the default of Group ID 10.

Note: Check group files, NIS maps, or LDAP for possible corruption. If you have not already populated appropriate files or maps, see System Administration Guide: Naming and Directory Services (DNS, NIS, and LDAP) on docs.sun.com. For LDAP, see also Solaris Management Console Help->About the Toolbox Editor->"To Manage LDAP."

After you add this user, you can change the primary group in the User Properties dialog box.