Why do I get error messages when I sync my calendar with Outlook?

[AC Question]

Since I was abroad and added a date direct from a hotel website I have not been able to sync my Calendar with Outlook on my pc. I am able to sync the contacts and tasks using Kies 3 but I get an error message telling me that there was a problem syncing the calendar to the device. Recently I have added the latest update to the phone downloaded via Kies 3. Please can someone help me sort this as I need to keep my electronic diaries in sync with each other.