Can't sign in to the app - 0auth error

I have successfully installed Apollo on my iPhone (yay!), but when I try to sign in, I get...

Error: Invalid request to 0auth API

I did get a personal API code and added it to the Artemis Client ID box. Same error.

I also followed the instructions at https://www.reddit.com/r/apolloapp/comments/11qq7bp/login_workarounds/ . Didn't work.

Help!

EDIT: I found the error. I had to go back to https://old.reddit.com/prefs/apps/ and update the API redirect to apollo://reddit-oauth . Working now! Hallelujah!