Invitees in iCal

[Argelius]

I'm new to SpanningSync (and gmail for that matter).

I'm using Spanning Sync to sync my iCal with Google Calendar (which
then syncs with the iPhone app Pocket Informant).

It may be a coincidence, but when I started using Spanning Sync, I
found that when I create a new iCal event and include someone in the
"invitees" field, that person then gets an error message when attempt
to add the event to their iCal ("iCal cant read this calendar file. No
events were added to your iCal Calendar").

Is this related to the Google Calendar syncing, or is it just a glitch
that coincided with me starting to use Spanning Sync?

Apologies if this has been addressed elsewhere, but my searches didn't
come up with much.