[otrs] OTRS and Agent LDAP login

Hi All, I have setup LDAP for Agent login almost successfully. Login is working but when i use this code in my config.pm to add the user standard to the group users. - - $Self->{'AuthSyncModule::LDAP::UserSyncInitialGroups'} = { 'users', }; - - I receive the following error when a user tries to login for the first time.. - - Software Error: Not an ARRAY reference at /opt/otrs//Kernel/System/Auth/Sync/LDAP.pm line 27 - - IUser is created but not added to the group. I'm using OTRS 2.4.5. does anyone have any idea what this could be? Thanks! Best, Dave