Hi knharper,
Please follow these steps to resolve this issue:
1. Click on the Apple in the upper left hand corner.
2. Click on System Preferences.
3. Click on Printers & Scanners.
4. Right click the blank space in the Printers list, and then click “Reset printing system”. Please note, this will remove all printers installed on your Mac.
5. Click “Reset” in the confirmation window.
6. Enter your administrator username and password, and then click OK.
7. When the printing system is reset and all of the printers are removed from the list, please restart your computer.
8. Click the Apple in the upper left hand corner.
9. Click on System preferences.
10. Click on Printers & Scanners.
11. Click the [+] at the bottom of the left side and then Add printer or scanner.
12. In the Add window, select your PIXMA MG6220 from the list and click Add.
13. Click “Print Using...”, and then select the PIXMA MG6220.
Once complete, please attempt to print.
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