by Emma Richardson.
What is the ldap_syncplus module it is referring to? Is that a plugin? Normally it is just ldap...
Are you running the sync from cli?
Is the moodleusers ou at the same level in your domain as your staff one? Are you sure the path is correct?
Does you bind user have the necessary permissions? Did you move your bind user when you moved the users? If so, you need to update the location of your bind user...