ERROR:"cannot set your user group" when logging in with GUI to OES2SP2 server

ERROR:"cannot set your user group" when logging in with GUI to OES2SP2 server with LUM (Linux User Management) enabled user
None of the Linux User Management (LUM) enabled users able to login from GUI

The nam entry is missing from the /etc/nsswitch.conf file.

1. To add this entry in the nsswitch.conf.
   *   Edit /etc/nsswitch.conf.
   *   There will be an entry called as passwd: compat  and group: compat.
   *   Add the word nam in front of both the lines. After making the changes it should look like:
        passwd: compat nam
        group: compat nam
   
2. In order to make the above settings work restart the xdm service on the server by typing the command rcxdm restart. Once that command runs it switches to command line interface (CLI) and will prompt to login.
   
3. Login as root and type the password. Type in startx and it will switch back to GUI screen.
4. Logout or restart the server and try to login to GUI Screen of server as an LUM enable user.