My iPad was printing to my HP wireless printer and now it won't. Wireless test report on app prints, but nothing else does. What else can I do to fix this?

On my iPad I have the HP app; it shows and identifies my printer; under Settings; My Printer it shows up as "Ready" with the correct IP address.

From that menu; I go to Utility; Printer Reports. My iPad will print the three reports (Printer Status, Network Configuration, Wireless Test Report). I immediately go to a Test email to see if it will print, and I get a "No AirPrint Printers Found."

What do I need to do to fix this? Thank you in advance.

Cheryl