500 Internal Server Error while signingUp

I have problem signing up. I am not sure what is the problem. I am following some yt video and creating my app. I was doing mostly the same stuff as the guy in the video, but i clearly have some problem. If you need something else from the code i can share. Thank you in advance.

//Error message    
xhr.js:178 
     POST http://localhost:5000/user/signUp 500 (Internal Server Error)
    dispatchXhrRequest  @   xhr.js:178
    xhrAdapter  @   xhr.js:12
    dispatchRequest @   dispatchRequest.js:52
    Promise.then (async)        
    request @   Axios.js:61
    Axios.<computed>    @   Axios.js:86
    wrap    @   bind.js:9
    signUp  @   index.js:6
    (anonymous) @   auth.js:6
    (anonymous) @   index.js:16
    handleSubmit    @   Auth.js:67
    callCallback    @   react-dom.development.js:188
    invokeGuardedCallbackDev    @   react-dom.development.js:237
    invokeGuardedCallback   @   react-dom.development.js:292
    invokeGuardedCallbackAndCatchFirstError @   react-dom.development.js:306
    executeDispatch @   react-dom.development.js:389
    executeDispatchesInOrder    @   react-dom.development.js:414
    executeDispatchesAndRelease @   react-dom.development.js:3278
    executeDispatchesAndReleaseTopLevel @   react-dom.development.js:3287
    forEachAccumulated  @   react-dom.development.js:3259
    runEventsInBatch    @   react-dom.development.js:3304
    runExtractedPluginEventsInBatch @   react-dom.development.js:3514
    handleTopLevel  @   react-dom.development.js:3558
    batchedEventUpdates$1   @   react-dom.development.js:21871
    batchedEventUpdates @   react-dom.development.js:795
    dispatchEventForLegacyPluginEventSystem @   react-dom.development.js:3568
    attemptToDispatchEvent  @   react-dom.development.js:4267
    dispatchEvent   @   react-dom.development.js:4189
    unstable_runWithPriority    @   scheduler.development.js:653
    runWithPriority$1   @   react-dom.development.js:11039
    discreteUpdates$1   @   react-dom.development.js:21887
    discreteUpdates @   react-dom.development.js:806
    dispatchDiscreteEvent   @   react-dom.development.js:4168

//This is controller function

export const signUp = async (req, res) => {
  const { email, password, confirmPassword, firstName, lastName } = req.body;
  try {
    const existingUser = await User.findOne({ email });
    if (exstingUser)
      return res.status(400).json({ message: 'User already exists.' });
    if (password !== confirmPassword)
      return res.status(400).json({ message: `Passwords don't match.` });
    const hashedPassword = await bcrypt.hash(password, 12);
    const result = await User.create({
      email,
      password: hashedPassword,
      name: `${firstName} ${lastName}`,
    });
    const token = jwt.sign(
      { email: result.email, id: existingUser._id },
      'test',
      { expiresIn: '1h' }
    );
    res.status(200).json({ result, token });
  } catch (error) {
    res.status(500).json({ message: 'Something went wrong' });
  }

//routes

import express from 'express';
import { signIn, signUp } from '../controllers/user.js';
const router = express.Router();

//localhost:5000/
router.post('/signIn', signIn);
router.post('/signUp', signUp);
export default router;

//actions

import { AUTH } from '../../constants/actionTypes';
import * as api from '../../api/index.js';
//Action Creators
export const signUp = (formData, history) => async (dispatch) => {
  try {
    const { data } = await api.signUp(formData);
    dispatch({ type: AUTH, data });
    history.push('/userHomePage');
  } catch (error) {
    console.log(error.message);
  }
};

//api

import axios from 'axios'; const API = axios.create({ baseURL: 'http://localhost:5000' });

export const signIn = (formData) => API.post('/user/signIn', formData); export const signUp = (formData) => API.post('/user/signUp', formData);

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