lpstat -p (this gives information about the printer)
printer DeskJet_845C disabled since Sun 08 Jan 2017 08:36:51 AM CET -
Rendering completed
printer PDF is idle. enabled since Wed 02 Dec 2015 06:39:46 PM CET
Now run the following command:
sudo cupsenable DeskJet_845C
and you will be fine.
