GraphQL throwing syntax errors

I am developing the GraphQL Node tutorial, and am up to step 7.

https://www.howtographql.com/graphql-js/7-subscriptions/

I am getting a number of syntax errors from this code in my datamodel.prisma file:

directive @id on FIELD_DEFINITION
directive @unique on FIELD_DEFINITION
directive @createdAt on FIELD_DEFINITION
scalar DateTime

type Link {
    id: ID! @id
    createdAt: DateTime! @createdAt
    description: String!
    url: String!
    postedBy: User
    votes: [Vote!]!
}

type User {
    id: ID! @id
    name: String!
    email: String! @unique
    password: String!
    links: [Link!]!
    votes: [Vote!]!
}

type Vote {
    id: ID! @id
    link: Link!
    user: User!
}

But am still getting 'User' type [@6:1] tried to redefine existing 'User' type [@15:5] and 'Link' type [@24:1] tried to redefine existing 'Link' type [@6:5].

I am also not sure if I am declaring directives or scalars correctly as this is missing from the official tutorial.

Can anyone give any advice on how to sort these issues?

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