'You cannot use the application ical.app with this version of Mac OS X'

When I first upgraded to 10.5 ical and calculator both crashed when starting and now after upgrading to 10.5.1 I get the following message - 'You cannot use the application ical.app with this version of Mac OS X'
This is only on my G4 powermac. No problem with Intel MacBook.

Are you, by any chance, one of "those people" that move applications to something other than the default location?
I know I am.
When I upgraded, I saw the same problem - I had moved iCal (among others) outside of "applications" to something like "Applications/Business Apps"
The version in "Business Apps" was the Tiger version, and it wouldn't run. However, the Leopard version (Installed to /Applications) worked fine.
So, I deleted the "Tiger" version, moved the iCal to where I wanted it, and all was well.
In a similar note, I put a number of iLive apps in a different folder -- and OS X software update stopped finding updates for those apps. I had to move them back to /Applications in order to get OS X software update to run them.

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