E601 - No element compiler or renderer registered

Cause

A slide contains an element of a type that no registered renderer or compiler handles. This usually means the element JSON doesn't carry the discriminating field for any built-in element type.

Example

An element object with no recognized type field — no markdown:, html:, image:, image_sequence:, iframe_html:, or mermaid:.

How to fix

Run scrolly schema element --list-types to see the valid element types, then scrolly schema element <type> for one's fields. Each element must include the field that names its type.