Hello,
Please write to contact[at]phpdocx.com and in the body of the message send the email or username of the user that owns the license, your user doesn't have a license tied.
Also check this topic, maybe your issue is the same:
http://www.phpdocx.com/en/forum/default/topic/1147
and that Tidy is installed and enabled on yourt server.
Regards.