why my ldap sync plugin can't create the filter user to my redmine? who can help me?

when config the "users objects" and fill the right one,then click the "Execute" button, i can get the use's information. but when i click the "save" button, then open the Administration->Users page ,i can't see the new user create. why?

you can see the detail info in the link:https://github.com/thorin/redmine_ldap_sync/issues/219