New project from swaggerhub import openApi 3.0.2 error

Hi,
I am trying to create a new project from swaggerhub definition ( openapi: 3.0.2 ) using readyApi 3.1.0
I have managed to find my private api and started import. It fails with following errors: 

attribute openapi is unexpected
attribute servers is unexpected
attribute components is unexpected
attribute swagger is missing

attribute paths.'/operationName'(post).[X-REQUEST-ID].schema is unexpected
attribute paths.'/operationName'(post).[X-REQUEST-ID].type is missing

My definition (parts mentioned in error messages):

openapi: 3.0.2
servers:
    - description: SwaggerHub API Auto Mocking
      url: 'https://virtserver.swaggerhub.com/.....'
info:
    description: |
        some description
    version: "0.0.4"
    title: title

tags:
    - name: tag1
      description: describ1

paths:
    /operationName:
        post:
            parameters:
                - in: header
                  name: X-REQUEST-ID
                  schema:
                      type: integer
                 required: true
                 description: 'Unique ID for the API request.'

It should be correct according to this: https://swagger.io/docs/specification/describing-parameters/

Do you have any idea, what might cause this?
From attribute openapi is unexpected and attribute swagger is missing it looks like openApi definition is not supported?

Thank you