Hi dhechler,
I installed the latest versions of Gravity Forms and SuperCPT, created a post type and a taxonomy, added meta fields to the post type, and I was able to create and edit forms just fine. My hunch is that you have a conflict in naming convention, but your issue could be any of a number of other things, like a conflict with another plugin or with your theme.
If you’re confident that the issue is with SuperCPT and it’s replicable in an environment with only those two plugins and with the Twenty Thirteen theme, and disabling SuperCPT resolves the error, please send me more details on the error, which versions you’re using of WordPress, SuperCPT, and Gravity Forms, and step-by-step instructions on how to reproduce the error.
Thanks!
Matt
