Repeat error on failing to update a read-only calendar

Calendar
1

I’m using eM 10.0.2622 (4be24cf) on Windows.
I have updated RSVP status on events to a Google calendar I’m subscribed to. But I’m read-only on this calendar.
When synching the calendar it errors with the below msg. This error pops up again and again regardless if I [ignore] or [cancel] the dialog.

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How do I get rid of this err?
Can we get those issues fixed? (1) em should not let me RSVP on a read-only calendar. (2) the repeat error is annoying. It should drop the issue behind after some retries.