Receiving the error as Cannot return null for non-nullable field rootMutation.createUser

[Mukesh0996]

//resolver code

const {buildSchema} = require('graphql')
const User = require('../modals/userModel');
const bcrypt = require('bcryptjs');

module.exports = {
    createUser: async function (email, password, name, req) {
        console.log(email, password, name) // this statement is not executing

        const existingUser = await User.findOne({email: email});
        if(existingUser) {
            const error = new Error ("User already exists");
            throw error;
        }

        const hashedPassword = await bcrypt.hash(password,12);

        const user = new User({
            email: email,
            password: hashedPassword,
            status: "I am New",
            name: name
        })

        const createdUser = await user.save();

        return { 
            email: createdUser.email,
            password:createdUser.password,
            status: createdUser.status
                }
    }
}

//schema code

const { buildSchema } = require('graphql');

module.exports = buildSchema(`
    type User {
        email: String!
        name: String!
    }
    type RootQuery {
        title: String
    }
    type rootMutation {
        createUser(email: String!, password: String!, name: String!): User!
    }

   schema {
       query:  RootQuery
       mutation: rootMutation
   }
);

error message

[IvanGoncharov]

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