angular-calendar subFn is not a function

I having troubles using the angular 5 calendar component https://mattlewis92.github.io/angular-calendar

The calendar renders perfectly, including events etc. However, Using mwlCalendarPreviousView and mwlCalendarNextView directives do not work.

Clicking on then do give the following error:

ERROR TypeError: subFn is not a function
at CalendarPreviousViewDirective.onClick (angular-calendar.js:239)
at Object.eval [as handleEvent] (PlanningOverview.html:58)
at handleEvent (core.js:13581)
at callWithDebugContext (core.js:15090)
at Object.debugHandleEvent [as handleEvent] (core.js:14677)


Navigating to the source of that onClick method shows me the following:

/**
* @hidden
* @return {?}
*/
CalendarNextViewDirective.prototype.onClick = function () {
var /** @type {?} */ addFn = {
day: addDays,
week: addWeeks,
month: addMonths
}[this.view];
this.viewDateChange.emit(addFn(this.viewDate, 1));
};
return CalendarNextViewDirective;


Which shows that subFn is indeed not a function.

I must be doing something wrong, but I can't find what...

(I'm using angular-calendar 0.23.2 on Angular 5.0.00)

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