This is not the final website. It is a demo of the real tool working, made for Y Combinator.
AxisRemedy

20-002 Name entry is missing or has an empty string as its value in an Optional Content Configuration Dictionary that is the value of the D entry in the OCProperties entry in the Catalog dictionary.

The default optional-content configuration (D) has no Name, or an empty one.

Checkpoint
20: Optional Content
ISO 14289-1 (PDF/UA-1) clause
7.10-1
Test type in the protocol
Machine-testable
Applies to
A single object

How AxisRemedy handles it

Tested by the app. AxisRemedy tests this condition itself. For each document it records passed, failed or not applicable, and for every failure the object and the page.

What the check covers

Reads the /D entry of the catalog's /OCProperties.

Repairs that target it

Repairs are optional. The few that could change how a page looks, such as embedding a missing font, need your explicit consent.