kfoltz23456 , Try by adding a different home launcher. After installing it go to settings and set up the new home launcher. If no go try a factory reset as some of your Apps/software/etc may have become corrupt. Check links below for more info. on how to get launcher working and how to perform a factory reset if need be. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.
http://zte-iqorsupport.custhelp.com/app/answers/detail/a_id/4597/~/phone-is-getting-an-error-message%3A-unfortunately-launcher-has-stopped.
http://www.hardreset.info/devices/zte/zte-quest-n817/