playground is completely broken

[xiaolongkipsi]

Prerequisites

• I have searched the existing issues
• I understand that providing a SSCCE example is tremendously useful to the maintainers.
• I have read the documentation
• Ideally, I'm providing a sample JSFiddle, Codesandbox.io or preferably a shared playground link demonstrating the issue.

What theme are you using?

core

Version

5.x

Current Behavior

No response

Expected Behavior

No response

Steps To Reproduce

No response

Environment

- OS:
- Node:
- npm:

Anything else?

No response

[isuvorov]

Error disappear if remove ObjectFieldTemplate from templates={{}}

The Error message:

Uncaught Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Check the render method of `ObjectField2`.