Trouble printing over wifi

I'm having problem with printing over wi-fi with my HP Deskjet 3520 with my macbook air with OS Yosemite 10.10.2. Ever since the upgrade, I have to plug my printer through the USB to do any printing. Tried downloading HP Utility to setup printer but Error says that Macbook can't find printer on Wi Fi. HELP PLEASE!!

Already tried deleting printer and re-adding printer on Printer & Scanner but nothing works.