strange message when login 7.0 CURRENT

[vuthecuong]

Everytime when I login to 7.0 CURRENT, this message
repeated. Is it harmless or harmful? And how can I solve it?
Tnx in advanced

Sep 27 22:08:50 hanhnhu login: in openpam_dispatch(): pam_nologin.so: no 
pam_sm_authenticate()
Sep 27 22:08:53 hanhnhu login: in openpam_dispatch(): pam_nologin.so: no 
pam_sm_setcred()
Sep 27 22:09:00 hanhnhu login: in openpam_dispatch(): pam_nologin.so: no 
pam_sm_setcred()
Sep 27 22:09:06 hanhnhu login: in openpam_dispatch(): pam_nologin.so: no 
pam_sm_authenticate()
Sep 27 22:10:54 hanhnhu login: in openpam_dispatch(): pam_nologin.so: no 
pam_sm_authenticate()
Sep 27 22:10:56 hanhnhu login: in openpam_dispatch(): pam_nologin.so: no 
pam_sm_setcred()