Error when changing ui widget field on playground

[Rubc]

Description

When changing the UI widget field on the UI schema, the page crashes wit this error:

Error: "No widget "t" for type "integer""

Steps to Reproduce

1. Open Playground on: https://rjsf-team.github.io/react-jsonschema-form/
2. Select the Number example
3. Change the "ui:widget" to another value

Expected behavior

Actual behavior

Version

You can usually get this information in your package.json or in the file URL if you're using the unpkg one.