Error Message When Creating a Custom Object

Hi All,
We’re looking to create a custom object by creating a new schema on the CRM custom objects page for the developer resource. We are receiving an error code called “Invalid primary display property: my_object_property” (screenshot attached). We can’t figure out what this is relating back to. Does anybody have experience with this or know what might be causing this?
Thanks

Hi @JHodgson

Probably the solution…

Click the see all params button at the bottom of the entry:

And it will reveal the primary display property, probably with the default value in place:

Let me know if this is it?