TypeError: Cannot read property 'object' of undefined

[Devmobilesutra]

i am getting following error while integrating react-event-calender
./node_modules/react-event-calendar/dist-modules/components/CalendarDay.js
G:/Vibhu Office MS/ReactJs_workspace/react_calendly/rj_calendly/node_modules/react-event-calendar/dist-modules/components/CalendarDay.js:76
73 |
74 |
75 | CalendarDay.propTypes = {

76 | day: _react2.default.PropTypes.object.isRequired,
77 | isToday: _react2.default.PropTypes.bool,
78 | events: _react2.default.PropTypes.array,
79 | onClick: _react2.default.PropTypes.func