[gentoo-user] anyone know what this line means?

[covici]

Hi.  I have been getting a strange line in my logs lately:

    (systemd): pam_systemd(systemd-user:session): Failed to create
    session: Invalid session class manager-early: 4 Time(s)
    So, anyone know what this means -- do I need to fix anything?

This is on a gentoo system updated about 3 weeks ago.

Thanks in advance for any suggestions.