Hi Liz - Thanks for the speedy response! I made both of these updates and still got the same error. I decided to quit the challenge and restart it, and after some additional tweaking, I was able to save my config (to be honest I’m not exactly sure what was causing this specific error - I’m still learning!
Thanks for the case-sensitive tip. I know you just saved me from a headache/ conundrum later today! 
-LK