TypeError: Cannot read property 'url' of undefined

I'm getting this error no matter what I try to change to fix it. As far as I can tell I've matched Guil's code completely

import React from 'react';
import {Route, NavLink, Redirect
} from 'react-router-dom';
//App Components
import HTML from './courses/HTML';
import CSS from './courses/CSS';
import JavaScript from './courses/JavaScript';

const Courses = ({match}) => (
  <div className="main-content courses">
    <div className="course-header group">
      <h2>Courses</h2> 
      <ul className="course-nav">
          <li><NavLink to={`${match.url}/html`}>HTML</NavLink></li>
          <li><NavLink to={`${match.url}/css`}>CSS</NavLink></li>
          <li><NavLink to={`${match.url}/javascript`}>JavaScript</NavLink></li>
      </ul>
    </div>

    {/* Write routes here... */}
      <Route exact path={match.path} render ={ () => <Redirect to={`${match.path}/html`} /> } />
      <Route path={`${match.path}/html`} component={HTML} />
      <Route path={`${match.path}/css`} component={CSS} />
      <Route path={`${match.path}/javascript`} component={JavaScript} />
  </div>
);

export default Courses;

It shows that it compiles successfully and I can view all the routes until I get to courses. × TypeError: Cannot read property 'url' of undefined Courses src/components/Courses.js:14 11 | <div className="course-header group"> 12 | <h2>Courses</h2> 13 | <ul className="course-nav">

14 | <li><NavLink to={`${match.url}/html`}>HTML</NavLink></li> 15 | <li><NavLink to={`${match.url}/css`}>CSS</NavLink></li> 16 | <li><NavLink to={`${match.url}/javascript`}>JavaScript</NavLink></li> 17 | </ul> View compiled ▶ 34 stack frames were collapsed. (anonymous function) src/index.js:6 3 | import App from './components/App'; 4 | import './css/index.css'; 5 | 6 | ReactDOM.render( 7 | <App />, 8 | document.getElementById('root') 9 | ); View compiled ▶ 6 stack frames were collapsed. This screen is visible only in development. It will not appear if the app crashes in production. Open your browser’s developer console to further inspect this error.