Error communicating with Coursemill. Please contact the Coursemill administrator.

Hello - I just had to reinstall Lectora 21 on a temporary loaner laptap because the C drive on my work issued laptop has been corrupted. So 21 is loaded, but now I'm getting an error message when I try to publish - I have up my Coursemill preferences set up the same way I've always set them up and I double checked my coursemill admin credential. I can publish to Reviewlink fine. Any suggestions??? Thanks