GraphQL Cannot query field '______' on type '______Page'

Question

I am new to GraphQL and am having trouble figuring out how to query things from a collection I have.

Here is my schema.gql:

type Property {
  address: String!
  challenges: [Challenge!] @relation
}

type Challenge {
  created: Time!
  property: Property!
  group: Group!
  guesses: [Guess!] @relation
  askingPrice: Float!
  soldForPrice: Float!
  dateSold: Time!
}

type Group {
  challenges: [Challenge!] @relation
  users: [User!] @relation
}

type User {
  name: String!
  groups: [Group!] @relation
  guesses: [Guess!] @relation
}

type Guess {
  price: Float!
  challenge: Challenge!
  user: User!
}

type Query {
  allProperties: [Property!]
}

and here is the query I am trying to run (in Postman as an HTTP POST with a GraphQL body):

query GetProperties {
    allProperties {
        address
    }
}

and this is the result I get:

{
    "data": null,
    "errors": [
        {
            "message": "Cannot query field 'address' on type 'PropertyPage'. (line 3, column 9):\n        address\n        ^",
            "locations": [
                {
                    "line": 3,
                    "column": 9
                }
            ]
        }
    ]
}

It's hard to Google because of the names of my things make it not generic.

Any help appreciated!