"Unable to load schema from '\': No content" error using JSON schema for YAML validation.

I am encountering an issue when I try to use a JSON schema file to validate my YAML files. I am using Eclipse and I have created the content type like so:

And added the following schema association for it:

But when I go to the file in question all I get is this error at the top:

I created it following this guide but selected a local file I had on my system rather than a web URL. Is this a bug or am I missing something?

My Schema:

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Test Schema",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "test": {
      "type": ["array", "null"]
    }
  }
}

My YAML (which should be invalid):

---
startList:
  - 1
  - 2

Inizia riproducendo l’associazione locale dello schema JSON in Eclipse con lo schema e gli esempi YAML forniti, quindi confrontala con la configurazione tramite URL web descritta nella guida collegata. Il lavoro è completato quando lo schema locale viene caricato senza l’errore “No content” e lo YAML non valido viene segnalato come previsto.