Hey I had the same problem, and I think it was because it was printing from the internet and required extra effort.
My dad checked if the right printer was connected- by first asking to print a test page and then selecting the printer with the name of the it first for example HP printer because for some reason another or the same printer came up but was connected to a comcast email first.
Then I selected print using not the buttons in the app (mine was through amazon) but by right clicking and printing from that drop down. Hope this helps somebody else