Problems using iCalendar with Google Calendar and Outlook

Problems using iCalendar with Google Calendar and Outlook

I can't get the "my work calendar" icalendar export function to work with external apps at all.
In google calendar, all that happens is that no appointments show up at all, and in Outlook I get this error when refreshing the calendar:
(translated from Swedish since my outlook is a Swedish version)
The task Subscriptions to Internet Calendars reported the following error (0x00040005): Unable to import any appointments from the iCalendar file.

I tried running the iCal file through an iCalendar validator, both with the url and with the ical file downloaded to my computer. The validator can be found at severinghaus.org/projects/icv/
I don't want to publish the adress to my calendar here on this forum, but here is the result I got from the validator:

Sorry, your calendar could not be parsed.
Error:
Error was: Error at line 24: Illegal property [ [PROJECT NAME - STRUCTURE AND INTERPRETATION OF COMPUTER PROGRAMS]
PART 1.1
PERCENT-COMPLETE]


Cause:
Caused by: Illegal property [ [PROJECT NAME - STRUCTURE AND INTERPRETATION OF COMPUTER PROGRAMS] <BR>PART 1.1<BR>PERCENT-COMPLETE]

It complains about the file not being valid iCal. Am I doing something wrong or is there a problem getting this to work for others as well?