I do not know why my code does not work it says the <div></div> does not work.

render() {
    return (
      <div>
        {this.props.isPrecise
          ? this.state.date.toISOString()
          : this.state.date.toLocaleTimeString()}
      </div>
    );
  }

I do not what to do because this is what i was thought in school.