title: Swagger Editor shows the "Schema error: should NOT have additional properties" error for a path parameter
body: <p>I'm using <a href="http://editor.swagger.io" rel="noreferrer">http://editor.swagger.io</a> to design an API and I get an error which I don't know how to address:</p>
  
  <pre><code>Schema error at paths['/employees/{employeeId}/roles'].get.parameters[0]
  should NOT have additional properties
  additionalProperty: type, format, name, in, description
  Jump to line 24
  </code></pre>
  
  <p>I have other endpoints defined in a similar way, and don't get this error. I wondered if I had some issue with indentation or unclosed quotes, but that doesn't seem to be the case. Google also did not seem to provide any useful results.</p>
  
  <pre class="lang-yaml prettyprint-override"><code>swagger: "2.0"
  info:
    description: Initial draft of the API specification
    version: '1.0'
    title: App 4.0 API
  host: api.com
  basePath: /v1
  tags:
    - name: employees
      description: Employee management
  schemes:
    - https
  paths:
    /employees/{employeeId}/roles:
      get:
        tags:
          - employees
        summary: "Get a specific employee's roles"
        description: ''
        operationId: findEmployeeRoles
        produces:
          - application/json
        parameters:
          - name: employeeId   &lt;====== Line 24
            in: path
            description: Id of employee whose roles we are fetching
            type: integer
            format: int64
        responses:
          '200':
            description: successful operation
            schema:
              type: array
              items:
                $ref: '#/definitions/Role'
          '403':
            description: No permission to see employee roles
          '404':
            description: EmployeeId not found
  </code></pre>
  
  <p>Any Hints?</p>