Error ''Missing class properties transform.'' when use Mobx in meteor

I am using Mobx with React and Meteor.
when I create this class:

import {observable} from 'mobx';

class ObservableTackStore {
    @observable filterObject = {
        name: null,
        value: null
    addObj() {


const observableTackStore = new ObservableTackStore();
export default observableTackStore;

I give the below error.

 imports/ui/mobx/states.js:4:16: /imports/ui/mobx/states.js: Missing class properties transform.

how to fix it? I don’t understand why throw this error?
thanks for help me.:slight_smile:

I’m having exactly the same error, have you found an answer yet?