"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

Start by reproducing the local JSON schema association in Eclipse with the provided schema and YAML examples, then compare it with the web URL setup described in the linked guide. The work is done when the local schema loads without the “No content” error and the invalid YAML is flagged as expected.