javascript - React/Flux: strange error while rendering -

i getting error while dynamically rendering component in react

findcomponentroot(..., .0.1.1.0.1.0.5.0.1:4): unable find element. means dom unexpectedly mutated (e.g., browser), due forgetting when using tables, nesting tags <form>, <p>, or <a>, or using non-svg elements in <svg> parent. try inspecting child nodes of element react id

i have checked out markup , seems fine. error changes on element, mean, appears affect element appears on other elements.

here render object:

render: function(){      var _slots = function(id, h, handleclick){          //react way         var daysforslot = this.props.workingdays.map(function(day, i){              var spanactive = this.state.appointments.map(function(appointment){                             var _activeclass = null;                             var _s = null;                              if(h.hour+day === appointment.hour+appointment.day){                                 _activeclass = 'active'                             }                              if(_activeclass){                                 _s = <span classname='active'>{appointment.patient.name}</span>                             }                               return (  {_s}  )             });              return (                 <td id={h.hour+day} onclick={handleclick.bind(null, {hour: h.hour, day:i})}>                     {spanactive}                 </td>             )     }.bind(this));       return(             <div>                 <td>{h.text}</td>                 <span>{daysforslot}</span>             </div>         )      }.bind(this);      //creates working hours days , bind click     //handler hour slots     var _schedule = this.props.workinghours.map(function(h, i){          return (                 <tr>                   <span>{_slots(i, h, this.handleclick)}</span>                 </tr>             )     }.bind(this));      return(         <span>             {_schedule}         </span>     ) } 

thanks in advance comments.

the html you're outputting invalid. have td directly inside of div - must direct child of tr. have span child of tr, not valid.