E006 - Field type mismatch (object expected)

Cause

A field that must be an object was given a different type — typically an entry inside slides: that should be a slide or group object.

Example

{ slides: ["just-a-string"] }

How to fix

Replace the entry with an object. For a slide entry: { id: "x", position: [0, 0], source: "x.slide.json" }.