Shao Sean Calendar Object Question

[Jeff Honken]

Is anyone using Shao Sean's Calendar Object ?

I've downloaded it but in the stack I keep getting a "Can't find
handler" Error when I change months.  It's for the object
calendarNextMonth.  Is there something I'm missing?  I can't find a doc
file for the stack so I'm slightly in the dark.  Graphically it looks
like a good calendar.  Is there any others out there that are better?
Jeff