HT2513 I have just upgraded to the icloud and now I am getting an error message on ical - saying "make sure the URL is correct", I haven't changed anything so why is it now an issue? any ideas?

I have just upgraded to the icloud and now I am getting an error message on ical - saying "make sure the URL is correct", I haven't changed anything so why is it now an issue? any ideas? 
The full message sasy "The calendar https:// cal.me.com:8443/principas/users/(server number) was not found on the server.  Make sure the URL is correct.

10.6.8 cannot access iCloud's facilities - you can set Mail up manually and there is a hack which some people have used to sync calendars (see below) - you cannot sync any other type of data.
This is the situation with iCloud and Snow Leopard:
Your email, calendars, and 'Find my iPhone' will be migrated to iCloud. Contacts and Bookmarks cannot be migrated from a Snow Leopard Mac.
Your iDisk, together with website hosting and Gallery, will continue to work as before until next June.
Syncing of Dashboard Widgets, Dock Items and Keychains between Macs, and Mail Accounts, Mail Rules, System Preferences, Signatures & Smart Mailboxes between Macs & iOS devices, will cease altogether.
You will be able to access email and calendars on the iCloud website at http://icloud.com provided your browser is reasonably up-to-date.
You will not be able to sync contacts or bookmarks from a pre-Lion Mac.
You will be able to enter the server settings for email manually in the Mail application and access your email.
You will not be able to sync your calendars directly.
Some people have been able to set up calendar syncing by using the method detailed here - this is an unsupported hack and may not be reliable, and may stop working at some future point.  BusyCal is an iCal-like calendar application with extra facilities: it can sync with the iCloud Calendar while running on Leopard, Snow Leopard or Lion.
There appears to be no method of syncing contacts (though Address Book on a Mac can be synced with Google or Yahoo address books - I don't know how reliable this is).

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