FullCalendar v.2.2.6 'hasTime' undefined error when using addEventSource

Question

I'm currently trying to test out FullCalendar (version 2.2.6) addEventSource

$('button').click(function() {
    $("#calendar").fullCalendar('removeEventSource', cal_events_1);
    $("#calendar").fullCalendar('addEventSource', cal_events_2);
});

but I'm always getting this error:

Uncaught TypeError: Cannot read property 'hasTime' of undefined

Both sources are hard coded and loading the calendar with either source loads the events successfully, so no date is incorrect.

var cal_events_1 = [
{
  events: [
  {
      title: 'event 1',
      start: '2015-01-04',
      color: 'tomato'
  },
  {
      title: 'event 2',
      start: '2015-01-09'
  }],
  color: '#55B2DA',
  textColor: '#3c3c3c'
},
{
  events: [
  {
      title: 'event 3',
      start: '2015-01-06'
  },
  {
      title: 'event 4',
      start: '2015-01-07'
  }],
  color: 'rgb(255, 162, 71)',
  textColor: '#3c3c3c'
},
{
    events: [
    {
        title: 'event 5',
        start: '2015-01-09'
    },
    {
        title: 'event 6',
        start: '2015-01-12'
    }],
    color: 'rgb(91, 228, 118)',
    textColor: '#3c3c3c'
}];

var cal_events_2 = [
{
  events: [
  {
      title: 'event 1',
      start: '2015-01-04',
      color: 'tomato'
  },
  {
      title: 'event 2',
      start: '2015-01-09'
  },
  {
      title: 'event 3',
      start: '2015-01-09'
  }],
  color: '#55B2DA',
  textColor: '#3c3c3c'
},
{
    events: [
    {
        title: 'event 4',
        start: '2015-01-09'
    },
    {
        title: 'event 5',
        start: '2015-01-12'
    }],
    color: 'rgb(91, 228, 118)',
    textColor: '#3c3c3c'
}];

Loading the calendar:

$("#calendar").fullCalendar({
    eventSources:  cal_events_1 // or cal_events_2
});

The error is displayed only when calling addEventSource. I'm not sure what's wrong exactly.

UPDATE

I know the documentation of addEventSource and removeEventSource mention using an array as a source but it looks like it does not work, cal_events_1 and cal_events_2 are both an array of objects. Using an object worked:

var my_events = {
  events: [
    {
      title: 'event 1',
      start: '2015-01-04',
      color: 'tomato'
    },
    {
      title: 'event 2',
      start: '2015-01-09'
    },
    {
      title: 'event 3',
      start: '2015-01-09'
    }
  ],
  color: '#55B2DA',
  textColor: '#3c3c3c'
};

$('button').click(function() {
    $("#calendar").fullCalendar('removeEvents');
    $("#calendar").fullCalendar('addEventSource', my_events);
});

Answer 1

You need the end time.

try this:

var my_events = {
  events: [
    {
      title: 'event 1',
      start: '2015-01-04',
      end: '2015-01-06',
      color: 'tomato'
    },
  ]
};