Hey @baholza,
This sounds like it could be the list item error that Phil mentioned here:
Do you have a list in your custom type? If so, try Phil's troubleshooting steps and let me know if that helps. We'll be pushing a fix for that error shortly.
If that's not the issue, could you use an app like Giphy to do a screen recording of the error so we can try to debug it? And could you also send your project files, in a .zip file or a GItHub repo? (You can send all of this by DM if you like.)
Sam