E401 - Asset file does not exist

Cause

An element references an asset file (via image:, an entry in image_sequence:, or similar) but the file doesn't exist on disk. Asset paths are resolved relative to the slide's .slide.json directory.

Example

{ image: "missing.png", position: [0, 0], width: 100 }

How to fix

Check the spelling and the path. Move the asset into the slide's directory (or a subdirectory referenced relatively).