Hi zach, want to ask if you can help me by experiencing this kind of issue.
I registered first a custom post type “Event” and it works fine. Suddenly when I registered a new one “Courses” post type, then this error happens. I though it would be a typo in my code but I notice there is no problem with my code. I tried gatsby clean hoping it re-fetching the data from graphql but still the error persist.
screenshot: https://imgur.com/kea4n1i
My repo: https://github.com/rayjencode/gatsby-wp-university