VueJS / Express with PRISMA ORM app based | Problem encountered while trying to post on VueJS side

Question

i'm following a Web Developer formation and i would like to understand how to fix my actual problem. I'm creating a kind of social media where you can create your account and post publications with VueJS and Express (PRISMA ORM).

My schema.prisma file looks like this (database model) :

model users {
 user_id   Int      @id @default(autoincrement()) @db.UnsignedInt
  firstName String   @db.VarChar(255)
  lastName  String   @db.VarChar(255)
  email     String   @unique(map: "email") @db.VarChar(255)
  password  String   @db.VarChar(255)  
  createdAt DateTime @default(now())
  isAdmin   Boolean  @default(false)
  post post[]
  comments comments[]
}

model post {
  post_id  Int    @id @default(autoincrement()) @db.UnsignedInt
  title    String @db.VarChar(50)
  content  String @db.Text
  author_id Int @db.UnsignedInt
  users     users @relation(fields: [author_id], references: [user_id])
  comments   comments[]

  @@index([author_id], name: "FK1_AUTHORID")
}

And my error comes out while i run this in my VueJS view, i put in localStorage my token so i have every informations about the current user connected :

<script>
import axios from 'axios';
export default {
    name: 'publish',
    data: function () {
        return {
            title: '',
            content: '',
            users: {},
        };
    },

    mounted() {
        axios
            .get("http://localhost:3000/auth/me", {
                headers: {
                    Authorization: "Bearer " + localStorage.getItem('token')
                }
            })

           .then(res => {
                this.users = res.data;
                console.log(res);
            })

            .catch(e => console.log(e));
    },

    methods: {
        createPublication() {
            axios
                .post("http://localhost:3000/main", {
                    headers: {
                        Authorization: "Bearer " + localStorage.getItem('token')
                    },
                    title: this.title,
                    content: this.content,
                })
            .then(res => {
                console.log(res);
                this.$router.push('/groupomania');
            })
            .catch(err => {
                console.log(err);
            })
        }
    }
}
</script>

But when i try to run this post route with the current code, i come out with this error :

Argument users for data.users is missing.

Note: Lines with + are required, lines with ? are optional.

I'm not sure how to fix that anyone has an idea ?

Thanks a lot, have a great day