Accept appointments via eMail-attachement

[linn]

Hello,

we've got a problem. It is not possible for us to accept an appointment by klicking the buttons above the invitation-eMail. But when we klick on the appointment in lightning, we can change the status to "confirmed"... Any ideas how to fix this?

Here's the log output, when i clicked the button above the mail:

append organizer 'mailto:user1@tocbe.de' to attendee list
attendee2participant=user2@tocbe.de role=REQ-PARTICIPANT
getParticipantByAttribute calendarId=0, attributeName=mail, attributeValue=user2, type=2
getParticipantByAttribute SQL: SELECT id FROM oxcalendar_participants_mapping WHERE calendar_id = ?1 AND mail = ?2 AND type = ?3
getParticipantByAttribute calendarId=0, attributeName=mail, attributeValue=user2@tocbe.de, type=1
getParticipantByAttribute SQL: SELECT id FROM oxcalendar_participants_mapping WHERE calendar_id = ?1 AND mail = ?2 AND type = ?3
resolved attendee to participant: ({id:"3", type:1})
attendee2participant=user1@tocbe.de role=REQ-PARTICIPANT
getParticipantByAttribute calendarId=0, attributeName=mail, attributeValue=user1, type=2
getParticipantByAttribute SQL: SELECT id FROM oxcalendar_participants_mapping WHERE calendar_id = ?1 AND mail = ?2 AND type = ?3
getParticipantByAttribute calendarId=0, attributeName=mail, attributeValue=user1@tocbe.de, type=1
getParticipantByAttribute SQL: SELECT id FROM oxcalendar_participants_mapping WHERE calendar_id = ?1 AND mail = ?2 AND type = ?3
resolved attendee to participant: ({id:"4", type:1})
attendee2participant=user1@tocbe.de role=null
[JavaScript Warning: "attendee user1@tocbe.de has no role, use default participant role"]
getParticipantByAttribute calendarId=0, attributeName=mail, attributeValue=user1, type=2
getParticipantByAttribute SQL: SELECT id FROM oxcalendar_participants_mapping WHERE calendar_id = ?1 AND mail = ?2 AND type = ?3
getParticipantByAttribute calendarId=0, attributeName=mail, attributeValue=user1@tocbe.de, type=1
getParticipantByAttribute SQL: SELECT id FROM oxcalendar_participants_mapping WHERE calendar_id = ?1 AND mail = ?2 AND type = ?3
resolved attendee to participant: ({id:"4", type:1})
getOXCalendarPref: name=identifier
attendee2participant=user1@tocbe.de role=REQ-PARTICIPANT
getParticipantByAttribute calendarId=0, attributeName=mail, attributeValue=user1, type=2
getParticipantByAttribute SQL: SELECT id FROM oxcalendar_participants_mapping WHERE calendar_id = ?1 AND mail = ?2 AND type = ?3
getParticipantByAttribute calendarId=0, attributeName=mail, attributeValue=user1@tocbe.de, type=1
getParticipantByAttribute SQL: SELECT id FROM oxcalendar_participants_mapping WHERE calendar_id = ?1 AND mail = ?2 AND type = ?3
addConfirmation2Data: read item status=null
internalObject2ox6Object
ox6_insertAppointment: host=http://ox.tocbe.net, appointmentData=({title:null, start_date:1303146900000, end_date:1303150500000, location:"", note:"", shown_as:1, private_flag:false, categories:"", alarm:-1, uid:"2c69e4f1-4cd2-414a-bf44-1024d34117f8", notification:false, participants:[{id:"3", type:1, confirmation:0}, {id:"4", type:1}, {id:"4", type:1}], ignore_conflicts:true, folder_id:"25"})
add appointment response: {"category":1,"error_params":[],"error":"Can not insert appointment with this uid. Uid already exists.","error_id":"23902786-10917","code":"APP-0100"}
[JavaScript Error: "cannot add item: TypeError: data is undefined"]
item:
Logging calIEvent:
	id:2c69e4f1-4cd2-414a-bf44-1024d34117f8
	title:null
	content:null
	transparency:OPAQUE
	status:null
	startTime:2011/04/18 15:15:00 UTC isDate=0
	endTime:2011/04/18 16:15:00 UTC isDate=0
	location:null
	privacy:PUBLIC
	alarmOffset:undefined
	alarmLastAck:null
	isOccurrence: false
	recurrenceId: null
	Organizer: 
		ID: mailto:user1@tocbe.de
			Name: null
			Rsvp: null
			Is Organizer: yes
			Role: REQ-PARTICIPANT
			Status: null
	Attendees: 

		ID: undefined
			Name: undefined
			Rsvp: undefined
			Is Organizer: no
			Role: undefined
			Status: undefined

		ID: undefined
			Name: undefined
			Rsvp: undefined
			Is Organizer: no
			Role: undefined
			Status: undefined
	recurrence: no
[JavaScript Error: "[Exception... "'[JavaScript Error: "data is undefined" {file: "file:///home/user2/.thunderbird/jkhblr28.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/modules/calUtils.jsm -> file:///home/user2/.thunderbird/jkhblr28.default/extensions/%7BE6050BDA-F130-11DD-8931-239656D89593%7D/js/ox6Handler.js" line: 128}]' when calling method: [calICalendar::addItem]"  nsresult: "0x80570021 (NS_ERROR_XPC_JAVASCRIPT_ERROR_WITH_DETAILS)"  location: "JS frame :: file:///home/user2/.thunderbird/jkhblr28.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/modules/calItipUtils.jsm :: anonymous :: line 845"  data: yes]"]