ReactJs CreateClass is not a function

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This is surely a version problem, If you are starting fresh, I would suggest you to create a React component by extending React.Component rather than using React.createClass since its deprecated from version 16.0 onwards and has been moved to a separate package 'create-react-class' as @Dream_Cap also mention

Also go with the ES6 syntax for imports. You would modify your code to 

import React from 'react';

export default class App extends React.Component {
    render(){
       return(
           <div>
               <h1> the list  </h1>
           </div>   
        )
     }
}

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