Adobe Pro DC license failure to authenticate

I have Adobe Pro DC.  I frequently receive the following error when I attempt to print a web page (in Firefox) to a PDF document: "Your request could not be completed. Adobe Acrobat license has either expired or not been activated.".  After receiving the error, the next attempt to print the same page normally succeeds.

Why is this occurring and what do I need to do to ensure that I never receive this blocking error again in the future?

Thanks,

Jeff Moritz