"errors":[{"rule":"required","field":"username","message":"required validation failed"} - adonis.js

Question

i am trying to validate my user resister form in adonis js by using
import {schema, rules} from '#ioc:Adonis/Core/Validator';
after register I am getting error of
{"errors":[{"rule":"required","field":"username","message":"required validation failed"},{"rule":"required","field":"username","message":"required validation failed"},{"rule":"required","field":"password","message":"required validation failed"},{"rule":"required","field":"phone","message":"required validation failed"}]}
validation code is
import { HttpContextContract } from '#ioc:Adonis/Core/HttpContext';
import {schema, rules} from '#ioc:Adonis/Core/Validator';
import user from 'App/Models/User';
export default class LoginController{
public async loginShow({view}:HttpContextContract){
return view.render('backend/login');
}
public async register({request,response,auth}:HttpContextContract){
const userSchema = schema.create({
username: schema.string({trim:true},[rules.required(), rules.unique({table:'users', column:'username', caseInsensitive: true})]),
email: schema.string({trim:true},[rules.email(), rules.required(), rules.unique({table:'users', column:'email', caseInsensitive: true})]),
password: schema.string({},[rules.minLength(6), rules.maxLength(20)]),
phone: schema.string({},[rules.unique({table:'users', column:'phone'})])
})
const data = await request.validate({schema: userSchema})
const User = await user.create(data)
await auth.login(User)
return response.redirect('/')
}
public async registerShow({view}:HttpContextContract){
return view.render('backend/register');
}
public async login({request,response,auth}:HttpContextContract){
const {uid, password} = request.only(['uid','password'])
try{
await auth.attempt(uid,password)
} catch (error){
console.log('form','your email or password is incorrect')
return response.redirect().back()
}
return response.redirect('/')
}
}
migration table is given below:
import BaseSchema from '#ioc:Adonis/Lucid/Schema'
export default class Users extends BaseSchema {
protected tableName = 'users'
public async up () {
this.schema.createTable(this.tableName, (table) => {
table.increments('id')
table.string('name',50).nullable()
table.string('username',50).unique().notNullable()
table.string('email',100).unique().notNullable()
table.string('phone',18).unique().nullable()
table.string('password',50).notNullable()
table.string('country',30).nullable()
table.string('city',40).nullable()
table.string('address_1',40).nullable()
table.string('address_2',40).nullable()
table.string('token',40).nullable()
table.dateTime('token_expiry')
table.boolean('is_active').defaultTo(false)
table.timestamps(true,true)
})
}
public async down () {
this.schema.dropTable(this.tableName)
}
}