Thunderbird startet ohne Kalender

[ImapModuleLoader] Using nsImapService.cpp
JavaScript error: resource:///modules/CalStartupService.jsm, line 18: uncaught exception: ParserError: invalid line (no token ";" or ":") "Europe/Oslo[2023c]"
JavaScript error: resource:///modules/CalStartupService.jsm, line 18: NS_ERROR_XPC_JS_THREW_JS_OBJECT: ParserError: invalid line (no token ";" or ":") "Europe/Oslo[2023c]"'ParserError: invalid line (no token ";" or ":") "Europe/Oslo[2023c]"' when calling method: [calIStartupService::startup]
console.debug: "Found 0 public keys and 0 secret keys (0 protected, 0 unprotected)"
console.error: Calendar: 
Can't create calendar for 552b62d1-31cf-4047-9ba3-659c7c7c283d (storage, moz-storage-calendar://): TypeError: right-hand side of 'in' should be an object, got undefined
console.error: Calendar: 
Can't create calendar for b8f99e7b-a63f-4dc1-87bb-7c2dce4fc73e (storage, moz-storage-calendar://): TypeError: right-hand side of 'in' should be an object, got undefined
JavaScript error: resource:///modules/calendar/Ical.jsm, line 5588: TypeError: zone is null
console.error: Calendar: 
Message: TypeError: zone is null
Stack:
convertToZone@resource:///modules/calendar/Ical.jsm:5588:26
CalDateTime.prototype.getInTimezone<@resource:///modules/CalDateTime.jsm:141:45
unwrapSetter@resource:///modules/calendar/Ical.jsm:29:22
unwrap/<@resource:///modules/calendar/Ical.jsm:25:48
now@resource:///modules/calendar/utils/calDateTimeUtils.jsm:62:17
getStartDate@chrome://calendar/content/calendar-invitations-manager.js:347:24
updateStartDate@chrome://calendar/content/calendar-invitations-manager.js:366:30
getInvitations@chrome://calendar/content/calendar-invitations-manager.js:172:10
_doInvitationsUpdate@chrome://calendar/content/calendar-invitations-manager.js:122:52
scheduleInvitationsUpdate/this.mTimer<@chrome://calendar/content/calendar-invitations-manager.js:115:18
JavaScript error: chrome://messenger/content/aboutMessage.js, line 119: NS_ERROR_ILLEGAL_VALUE: Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIWebProgress.addProgressListener]
JavaScript error: resource:///modules/calendar/calStorageHelpers.jsm, line 83: uncaught exception: ParserError: invalid line (no token ";" or ":") "Europe/Berlin[2023c]"
console.warn: Calendar: Message: [Exception... "ParserError: invalid line (no token ";" or ":") "Europe/Berlin[2023c]"'ParserError: invalid line (no token ";" or ":") "Europe/Berlin[2023c]"' when calling method: [calITimezoneService::getTimezone]" nsresult: "0x8057001c (NS_ERROR_XPC_JS_THREW_JS_OBJECT)" location: "JS frame :: resource:///modules/calendar/calStorageHelpers.jsm :: getTimezone :: line 83" data: no]
JavaScript error: resource:///modules/calendar/calStorageHelpers.jsm, line 83: uncaught exception: ParserError: invalid line (no token ";" or ":") "Europe/Oslo[2023c]"
console.warn: Calendar: Message: [Exception... "ParserError: invalid line (no token ";" or ":") "Europe/Oslo[2023c]"'ParserError: invalid line (no token ";" or ":") "Europe/Oslo[2023c]"' when calling method: [calITimezoneService::getTimezone]" nsresult: "0x8057001c (NS_ERROR_XPC_JS_THREW_JS_OBJECT)" location: "JS frame :: resource:///modules/calendar/calStorageHelpers.jsm :: getTimezone :: line 83" data: no]
JavaScript error: resource:///modules/calendar/calStorageHelpers.jsm, line 83: uncaught exception: ParserError: invalid line (no token ";" or ":") "Europe/Oslo[2023c]"
console.warn: Calendar: Message: [Exception... "ParserError: invalid line (no token ";" or ":") "Europe/Oslo[2023c]"'ParserError: invalid line (no token ";" or ":") "Europe/Oslo[2023c]"' when calling method: [calITimezoneService::getTimezone]" nsresult: "0x8057001c (NS_ERROR_XPC_JS_THREW_JS_OBJECT)" location: "JS frame :: resource:///modules/calendar/calStorageHelpers.jsm :: getTimezone :: line 83" data: no]
.... und viele weitere Meldungen, die sehr ähnlich aussehen.