Can't save my template

[F_bio Santos]

Im trying to save the template I created, but when I click on the "Save Template" the following appears:

When I click on the link I get this:

And it won't let me save the template, I think it is because Im using reference fields and Im trying to extend another table.

[Paige Duffey]

Hello-I pulled the below from this page.

Error message	Definition	More details
Unsupported_table	Record class for which there is no allow rule, and there’s an unknown level of support.	One or more unsupported records are unrecognized by App Engine Studio and must be removed for the template creation process to continue.