reactjs - React Tutorial - Cannot read property 'toString' of undefined -

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i need learn react in next day , started official tutorial. until state of code getting error , not sure how around it:

</head>     <body>     <div id="content"></div>      <!-- script type="text/babel" src="scripts/example.js"></script -->      <script type="text/babel">        var commentbox = react.createclass( {           render: function() {             return (               <div classname = "commentbox">                 <h1>comments</h1>                 <commentlist />                 <commentform />                 <comment />               </div>               );          }        });            var commentlist = react.createclass({             render: function () {               return (                <div classname = "commentlist">                   <comment author = "michael johnson">this 1                        comment</comment>                   <comment author = "daniel kammer">this 'second'                        comment</comment>                   </div>                );             }           });             var commentform = react.createclass({             render: function () {               return (                 <div classname = "commentform">                    hello, world! commentform.                 </div>                 );             }           });            var comment = react.createclass({            var md = new remarkable();            render: function () {           return (             <div classname = "comment">               <h2 classname = "commentauthor">                 {this.props.author}               </h2>             *** error generated below statement ***                 {md.render(this.props.children.tostring())}             </div>             );         }       });

the rest of tutorial continues forward md.render statement - need understand how resolve error

it's caused <comment /> in comentbox component, probably. children components required proper work of comment component, closed tag has no childrens (this.prop.childrens null or undefined => method tostring not declared)


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