We recently upgraded to FrameMaker 2019 and I am recieving the following error when trying to save the book as PDF
@Jeani5CF5 - you should also know that this isn't Adobe Support - it's a user-to-user forum. If you need to talk to the FM folks, see https://helpx.adobe.com/contact/enterprise-support.other.html#framemaker for your Adobe Support options. I'd recommend using the firstname.lastname@example.org e-mail address as it reaches a team dedicated to Technical Communication Suite products including FrameMaker.
Let us know if you get it fixed. Not everyone is quickly retiring print problems lately, and it's probably not an Adobe problem.