ldap auth plugin

i have installed the ldap auth plugin and am able to authenticate to ldap server after performing add user, the newly added users  are successfully authenticating the ldap servers . The users are are not auto created after succesfully login,I have to create the users in elgg ,once created they can successfully authenticate to ldap.I have enable autocreate.

If I disabled the create user setting the alert starts with: "Your credentials are valid, but no account was found..."

If I enabled the create user setting the alert starts with: "we could not login,please check username and password"