Hi there,
by any chance do you have Pods installed?
Yes, right. Is there a workaround?
the issue is that Pods hooks into the get_avatar filter which it does a get_screen if in admin. The problem is that I call this at wp_loaded and the get_screen function isn’t defined yet. Basically its trying to do something that doesn’t exist. While not entirely a Caldera Forms issue or a Pods issue, its just a clash.
I made a change which calls it later so the Pods hook is no longer affected. You can install the 1.1.x branch from the GitHub repo which has the fix. https://github.com/Desertsnowman/Caldera-Forms