Error receiveing meteor data with react - mixin

meteor complains (1.3 beta) that there’s a error with that mixin definition ` import React from ‘react’;
import {bootstrap} from ‘react-bootstrap’;

export class App extends React.Component {
mixins: [ReactMeteorData],
getMeteorData(){
return{
task: Lessons.find({}, {sort: {createdAt: -1 }}).fetch(),
currentUser: Meteor.user()
}
},

` but I used this syntax before w/o any problem

Read this :wink: