The sidenav example doesn\'t work

import React, { Component } from 'react';
import { BrowserRouter as Router } from 'react-router-dom';
import SideNavPage from './components/SideNavPage'

class App extends Component {
  render() {
    return (
      <div>
        <SideNavPage/>
      </div>
    );
  }
}

export default App;

import React from 'react';
import { BrowserRouter as Router } from 'react-router-dom';
import { Fa, SideNavItem, SideNavCat, SideNavNav, SideNav, SideNavLink, Container, Row } from 'mdbreact';

class SideNavPage extends React.Component {
constructor(props) {
super(props);
this.state ={
isLeftOpen: false,
isRightOpen: false
};
}

// Slide out buttons event handlers
handleToggleClickA = () => {
this.setState({
isLeftOpen: !this.state.isLeftOpen
})
}
handleToggleClickB = () => {
this.setState({
isRightOpen: !this.state.isRightOpen
})
}

render() {
// Because the toggling buttons are nearly identical, we create a function to render them:
const createButton = (onClick, side) => {
return <div style={{width: "50%", textAlign: "center"}}>
<a href="#!" onClick={onClick} key={'toggleThe'+side+'SideNav'}><Fa icon="bars" size="5x"></Fa></a>
</div>
}

return (
<Router>
<div>
<Container>
{/* the buttons toggling visibility of SideNavs: */}
<Row style={{height: "80vh", alignItems: "center"}} >
{createButton(this.handleToggleClickA, "Left")}
{createButton(this.handleToggleClickB, "Right")}
</Row>

{/* the left SideNav: */}
<SideNav hidden triggerOpening={this.state.isLeftOpen} breakWidth={1300} className="deep-purple darken-4">
<li>
<ul className="social">
<li><a href="#!"><Fa icon="facebook"></Fa></a></li>
<li><a href="#!"><Fa icon="pinterest"></Fa></a></li>
<li><a href="#!"><Fa icon="google-plus"></Fa></a></li>
<li><a href="#!"><Fa icon="twitter"></Fa></a></li>
</ul>
</li>
<SideNavNav>
<SideNavCat id="submit-blog-cat" name="Submit blog" icon="chevron-right">
<SideNavLink>Submit listing</SideNavLink>
<SideNavLink>Registration form</SideNavLink>
</SideNavCat>
<SideNavCat id="instruction-cat" name="Instruction" icon="hand-pointer-o" href="#">
<SideNavLink>For bloggers</SideNavLink>
<SideNavLink>For authors</SideNavLink>
</SideNavCat>
<SideNavCat id="about-cat" name="About" icon="eye">
<SideNavLink>Instruction</SideNavLink>
<SideNavLink>Monthly meetings</SideNavLink>
</SideNavCat>
<SideNavCat id="contact-me-cat" name="Contact me" icon="envelope-o">
<SideNavLink>FAQ</SideNavLink>
<SideNavLink>Write a message</SideNavLink>
</SideNavCat>
</SideNavNav>
</SideNav>

{/* the right SideNav: */}
<SideNav hidden triggerOpening={this.state.isRightOpen} className="side-nav-light" right breakWidth={1300}>
<li>
<ul className="social">
<li><a href="#!"><Fa icon="facebook"></Fa></a></li>
<li><a href="#!"><Fa icon="pinterest"></Fa></a></li>
<li><a href="#!"><Fa icon="google-plus"></Fa></a></li>
<li><a href="#!"><Fa icon="twitter"></Fa></a></li>
</ul>
</li>
<SideNavNav>
<SideNavCat id="submit-blog-cat" name="Submit blog" icon="chevron-right" >
<SideNavLink className="active">Submit listing</SideNavLink>
<SideNavLink>Registration form</SideNavLink>
</SideNavCat>
<SideNavCat id="instruction-cat" name="Instruction" icon="hand-pointer-o">
<SideNavLink>For bloggers</SideNavLink>
<SideNavLink>For authors</SideNavLink>
</SideNavCat>
<SideNavCat id="about-cat" name="About" icon="eye">
<SideNavLink>Instruction</SideNavLink>
<SideNavLink>Monthly meetings</SideNavLink>
</SideNavCat>
<SideNavCat id="contact-me-cat" name="Contact me" icon="envelope-o">
<SideNavLink>FAQ</SideNavLink>
<SideNavLink>Write a message</SideNavLink>
</SideNavCat>
</SideNavNav>
</SideNav>

</Container>
</div>
</Router>
);
}
}

export default SideNavPage;