sync not working properly

[vivekabhosale14]

for 1st time it's working fine, but after some time add some user in AD then I again do scheduling using python manage.py syncldap this command it thrown error for me -- get() returned more than one user -- it returned 2!

I also try LDAP_SYNC_USERNAME_FIELD ="username" and LDAP_SYNC_USERNAME_FIELD =None

but it's not working for me