cmCalendar not showing up

[Vargas]

Hi there,

I have used calendar before and it worked quite well. Now i am using it again for a new project but i can not get it to show up in Front-End...
In the backend, there is a error message.

Warning: implode(): Invalid arguments passed in D:\www\mydomain\www\include\inc_module\mod_cm_calendar\inc\cnt.form.php on line 43

Anyone got some ideas ?

UPDATE 27-3-2013
================
I managed to remove the error message but cmCalendar is still not showing up. Looks like the content part is displayed just not showing the calendar or it's content....