After updating my model, I can't seem to see the updates on graphiQL interface

I’m new to realm and graphQL. So I’m not sure if I’m doing something wrong within realm studio, but I have the following case.

I have created a class Categories with the following items
uuid, name, type, questions

Then I modified the class and added a field called “language”

Now when I open GraphiQL and try to do a simple query

query {
  categories {
    name,
    language
  }
}

I get the following error

{
  "errors": [
    {
      "message": "Cannot query field \"language\" on type \"Category\".",
      "locations": [
        {
          "line": 17,
          "column": 11
        }
      ]
    }
  ]
}

I found the solution.

I just needed to delete schema using DELETE https://url/graphql/schema/:path