E208 - Template-slide stub invalid

Cause

A .slide.json template-slide stub — the form whose top level carries template_file: instead of elements: — has extra top-level keys, or its with: is not an object. A stub holds only the instantiation; every slide field (title, scroll behavior, elements) comes from the factory template.

Example

{ template_file: "../factories/detail.slide.json.j2",
  with: { n: 1 },
  title: "override" }   // <- not allowed

How to fix

Move the field into the factory template (parameterize it via with: if it varies per slide), leaving only template_file and with in the stub.