swagger editor: can't add local reference with $ref - swagger

Question

I'm creating some API through swagger.
I can't understand how I can use $ref with a reference on the same file...
Here's my current swagger file:
openapi: 3.0.0
info:
title: test API
version: "1.0.0"
description: This is a sample API.
servers:
- url: http://api.internal.com/api
paths:
/sources/:
get:
summary: returns all sources given a page and a size
parameters:
- name: page
required: true
in: query
description: Limits the number of items on a page
schema:
type: integer
- name: size
required: true
in: query
description: Specifies a page size
schema:
type: integer
responses:
'200':
$ref: '#/definitions/myElement'
definitions:
myElement:
"data": {
"sources": [
{
"id": "fw5pQ08wMnFfbEE",
"fileName": "test.csv",
"size": 1000000,
"annotatedDate": "2018-10-01 12:00:00",
"metadataContact": "test#test.com",
"canBeIngested": true
}
],
"stats": {
"total": 4000,
"page": 1,
"size": 20
}
}
Now, the problem is that the editor is throwing me this error:
Errors
Schema error should NOT have additional properties
additionalProperty: definitions
Jump to line 0
in the documentation of $ref I can't really find anything helpful...
How can I fix this?

Answer 1

In OpenAPI 3.0, definitions were replaced with components/schemas. This means you need to use:
responses:
'200':
$ref: '#/components/schemas/myElement'
and
components:
schemas:
myElement:
...
Also, your model definition for myElement is not valid. See this guide to learn how to describe objects, properties, etc.