Hi all, I'm running calendar/contacts server for about half a year using the debian testing version (9.2+dfsg-1). Sometimes I get the following error: [txdav.caldav.datastore.scheduling.implicit#error] Unable to format event {'log_level': <LogLevel=error>, 'log_source': None, 'log_format': u'single-organizer: Only one ORGANIZER is allowed in an iCalendar object:\n{calendar}', 'calendar': <Component: 'BEGIN:VCALENDAR VERSION:2.0 {...snip...}'>, 'log_logger': <Logger 'txdav.caldav.datastore.scheduling.implicit'>, 'log_time': 1554185763.126154, 'log_namespace': 'txdav.caldav.datastore.scheduling.implicit'}: 'ascii' codec can't decode byte 0xc3 in position 1071: ordinal not in range(128) Position 1071 is: SUMMARY:Abstimmung unserer Aktivit\xc3\xa4ten This happens if I receive an external invitation by email to an event created with outlook. I use thunderbird as caldav client. There seem to be two problems: - Only one ORGANIZER is allowed in an iCalendar object - ascii' codec can't decode byte 0xc3 in position 1071 How can I avoid the error? Is this a misconfiguration? If yes - on the server or the client? If it is a bug, should I report this as a bug against the debian package? Kind regards Dominik