GraphQL : “message”: “Unknown variable `aRTICLE_group`.”

I have the following type in my schema.graphql script:

type ARTICLE {
   _id: Long!
   community: Int!
   familyComponent: Int!
   id: Int!
   label: String!
   seed_label: Int
   title: String!
   similar: [ARTICLE] @relation(name: "SIMILAR", direction: OUT)
   SIMILAR_rel: [SIMILAR]
   keywords: [KEYWORD] @relation(name: "APPEARS_IN", direction: IN)
   group: [ARTICLE]
    @cypher(
      statement: "MATCH (a:ARTICLE) RETURN a.community as id, COLLECT(a) AS articles"
    )
}

I tried to query it, for example:

query {
  ARTICLE{
    title
    group{id}
  }
}

But I have the error Unknown variable aRTICLE_group

I saw that other developers have this error so I don't if the error comes from what I coded