ical 4 won't import .ics file
hi
i recently planned a trip on public transport and was able to download the info in a .ics file. when attempting to import this file to ical (4), i got the message; ical can't read this calendar file. i also tried to drag + drop straight to my ical but to no avail. i added a screenshot to show the message. all my info is also synced on mobileme. i can't figure out the solution so help would be appreciated.
iMac 21.5 inch 3.06 gb. processor, 1 tb hd., 4 gb ram + macbook pro 13inch 2.53, Mac OS X (10.6.7)