I've got an ics-File containing the problematic calendar. It is dumped via wget direct from the davical database. Uncompressed 116k. Not so big as i thought. Would this help?
This error only occurs on one of the nine calendars in this account. It would be possible to create an own account for you on the server, but unfortunately i'm not allowed to gain access to this account and the other calendars, as these contain high secret future appointments and events.
there are 2 different errors in your e-mail:
I don't think that this can help to debug the issue, because this problem is related to calendar-multiget REPORT (we get raw data from the server without processing the content). Data processing is performed ONLY if this request is successful ...