title: How to fix Invariant Violation: Minified React error #143 for CSSTransition from react-transition-group
body: <pre><code>import React, { Component, Fragment } from "react";
  import PreviewPanel from "./containers/PreviewPanel";
  import { CSSTransition  } from "react-transition-group";
  
  class App extends Component {
    render() {
      return (
        &lt;Fragment&gt;
          &lt;PreviewPanel&gt;&lt;/PreviewPanel&gt;
          &lt;CSSTransition&gt;&lt;/CSSTransition&gt;
        &lt;/Fragment&gt;
      );
    }
  }
  
  export default App;
  </code></pre>
  
  <p>It's Invariant Violation: Minified React error #143. When I remove the CSSTransition block, It's working correctly. please help me how to use CSSTransitoin without error?</p>