So an update on this error. It only appears when I use the Google Calendar ID as part of the Server/URL address. This is to allow subscribing to particular calendars. On PR 1.0 and 1.1 I was able to subscribe to individual calendars on Google Calendar. There are instructions on how to do this, for example here.

"For Account URL, specify “https://www.google.com/calendar/dav/[Google Calendar ID]/user”. Note that it’s actually “/user” there at the end, not your user name. The Google Calendar ID in brackets is visible in Google Calendar by going to the settings for a calendar and looking toward the bottom of the Calendar Details tab. You’ll see some funky junk like “asdfjklasdfjklasdjklasdjkl@group.calendar.google. com” or similar. That’s the Google Calendar ID."

Is this a bug or has this capability simply been removed in PR 1.2?