React.js code runs in local server but not in Plunker

I am trying to follow a simple tutorials. My test code runs perfectly in my local server. But when I try to adapt the code to Plunker, it cause an error that I couldn't figure out why. The code runs fine in Snippet. Maybe I miss something. Plz help. :(

const Timer = ({currentValue}) => {
  return(
    <div className="Time">
      {currentValue}
    </div>
  );
};

class App extends React.Component {
  constructor(props){
    super(props);

    this.state = {currentValue: 150};

    setInterval(
      () => {
        this.setState({currentValue: this.state.currentValue - 1});
      }, 1000
    );
  }
// This cause an Unknown error in Plunker
  resetTimer = () => {
      this.setState({currentValue:150});
  };

  render() {
    return (
      <div className="App">
        <Timer currentValue={this.state.currentValue} />
        <button onClick={this.resetTimer}>Reset</button>
      </div>
    );
  }
}

ReactDOM.render(
  <App />,
  document.getElementById('example')
);

<!DOCTYPE html>
<html>

  <head>
    <script data-require="react@*" data-semver="15.2.0" src="https://cdnjs.cloudflare.com/ajax/libs/react/15.2.0/react.min.js"></script>
    <script data-require="react@*" data-semver="15.2.0" src="https://cdnjs.cloudflare.com/ajax/libs/react/15.2.0/react-dom.min.js"></script>
    <link rel="stylesheet" href="style.css" />
  </head>

  <body>
    <div id="example"></div>
    <script src="script.js"></script>
  </body>

</html>

Solution

Ur code is proper, don't know why it is not working on plunker, same code is working on Jsfiddle, you can try this alternative, bind the onClick method manually, it will work, Try this:

const Timer = ({currentValue}) => {
  return(
    <div className="Time">
      {currentValue}
    </div>
  );
};

class App extends React.Component {
  constructor(props){
    super(props);

    this.state = {currentValue: 150};

    setInterval(
      () => {
        this.setState({currentValue: this.state.currentValue - 1});
      }, 1000
    );
  }
  resetTimer(){
      this.setState({currentValue:150});
  };

  render() {
    return (
      <div className="App">
        <Timer currentValue={this.state.currentValue} />
        <button onClick={this.resetTimer.bind(this)}>Reset</button>
      </div>
    );
  }
}

Check the Working Code on-

plunker code: https://plnkr.co/edit/NZPKuTdnIvL75IKgApFZ?p=preview

jsfiddle: https://jsfiddle.net/ypt9q7p6/