I updated my galaxy this mornig to the release 16_01.

But now my LDAP connection is nort working I have this error 

galaxy.auth.providers.ldap_ad DEBUG 2016-05-17 15:23:38,681 LDAP authenticate: could not load ldap module

Do you have any idea, I checked the auth_conf.xml and it is still the same as the previous one.

Mohamed