ERROR Error: schema is invalid: data/properties/form should be object,boolean about ajsf HOT 3 CLOSED

{
  "schema": {
    "type": "object",
    "properties": {
      "commentary": {
        "title": "commentary",
        "type": "string",
      },
      "depCommentary": {
        "title": "dependant commentary",
        "type": "integer"
      },
    "notDisplayedcommentary": {
        "title": "this commentary will not be displayed no matter what",
        "type": "string",
      },
    },
    "required": [
    ]
  },
  "form": [
    {
      "type": "help",
      "helpvalue": "<p>This is a work around to use conditions in <b>angular6-json-schema-form</b>. </br> Schema Form does not support oneOf (yet), but you can do a workaround and simulate certain scenarios with 'condition' and 'required'  (and/or 'readonly') in the form.</p>"
    },
    "commentary",
    {
      "key": "depCommentary",
      "condition": "model.commentary",
      "required": true
    },
    {
      "key": "depCommentary",
      "condition": "!model.commentary"
    },
    {
      "type": "submit",
      "style": "btn-info",
      "title": "OK"
    }
  ]
}