Support Calendar Help

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http://androidforums.com – I've been getting the "Unfortunately, Calendar has stopped" error. It happens, well when I use the Calendar lol. I can open it but as soon as I try to do something it closes. I'm using the Google Calendar, and tried downloading aCalendar but it does the same thing. This might be the kicker, I removed S Calendar (or is it called S Planner?) from the phone using Titanium Backup... I just can't recall using Google Calendar afterwards or not... How do I download S Planner/Calendar again? Or is the problem something else? I went into the app manager and cleared the Google Calendar (General)