@aquaman after debugging, the problem is the file created by fb2ics has linux line ends (\n), but the code is looking for windows line ends (\r\n)
once I edited and saved with windows line ends it works
you could use unix2dos on it to convert the line ends
I have opened an issue and submitted a pull request to the ical parser github project for this
https://github.com/peterbraden/ical.js/issues/105