Uncaught TypeError: _this.props.onSubmit is not a function when using redux-form

I'm working with a React.js frontend, and when I try to login or signup I get the below error when clicking the login or Sign up buttons.

Uncaught TypeError: _this.props.onSubmit is not a function

The stacktrace is pointing to the following file,

/src/containers/Login/index.js

// @flow
import React, { Component } from 'react';
import { Field, reduxForm } from 'redux-form';
import { Link } from 'react-router-dom';
import { css, StyleSheet } from 'aphrodite';
import Input from '../../components/Input';

const styles = StyleSheet.create({
  card: {
    maxWidth: '500px',
    padding: '3rem 4rem',
    margin: '2rem auto',
  },
});

type Props = {
  onSubmit: () => void,
  handleSubmit: () => void,
  submitting: boolean,
}

class LoginForm extends Component {
  props: Props

  handleSubmit = (data) => this.props.onSubmit(data);
  // handleSubmit: (data) => this.props.onSubmit(data);


  render() {
    const { handleSubmit, submitting } = this.props;

    return (
      
Login to Sling

          {submitting ? 'Logging in...' : 'Login'}
        

          Create a new account
        </Link>
      </form>
    );
  }
}

const validate = (values) => {
  const errors = {};
  if (!values.email) {
    errors.email = 'Required';
  }
  if (!values.password) {
    errors.password = 'Required';
  }
  return errors;
};

export default reduxForm({
  form: 'login',
  validate,
})(LoginForm);

specifically the below line,

  handleSubmit = (data) => this.props.onSubmit(data);

Again, any and all help is greatly appreciated.