It would be most helpful if you could provide the things that you have already tried. Otherwise, I'm likely to repeat them.
First, I would turn the printer on and off and reboot the computer.
If that doesn't help, then I would suggest removing the printer - deleting it from your computer - and then reinstalling it. If you have software that came with it, you can uninstall the software and then reinstall the software. Even better, you can download the latest version of the software here: