Fatal error: Uncaught exception Error with message Class 'vcalendar' not found thrown in system/modules/calendar_ical/classes/CalendarImport.php on line 93
#0 system/modules/calendar_ical/classes/CalendarImport.php(84): Contao\CalendarImport->importFromWebICS('3', NULL, Object(Contao\Date), Object(Contao\Date), Array)
#1 system/modules/calendar_ical/classes/CalendarImport.php(61): Contao\CalendarImport->importCalendarWithData(Array)
#2 system/modules/calendar_ical/classes/CalendarImport.php(32): Contao\CalendarImport->importCalendarWithID('3')
#3 system/modules/calendar_extended/classes/EventsExt.php(555): Contao\CalendarImport->getAllEvents(Array, Array, 1669849200, 1672527599, Object(Contao\ModuleCalendar))
#4 system/modules/calendar_extended/modules/ModuleCalendar.php(258): Contao\EventsExt->getAllEventsExt(Array, 1669849200, 1672527599, Array)
#5 system/modules/calendar_extended/modules/ModuleCalendar.php(200): Contao\ModuleCalendar->compileWeeks()
#6 system/modules/core/modules/Module.php(287): Contao\ModuleCalendar->compile()
#7 system/modules/calendar_extended/modules/ModuleCalendar.php(120): Contao\Module->generate()
#8 system/modules/core/elements/ContentModule.php(59): Contao\ModuleCalendar->generate()
#9 system/modules/core/library/Contao/Controller.php(484): Contao\ContentModule->generate()
#10 system/modules/core/modules/ModuleArticle.php(213): Contao\Controller::getContentElement(Object(Contao\ContentModel), 'main')
#11 system/modules/core/modules/Module.php(287): Contao\ModuleArticle->compile()
#12 system/modules/core/modules/ModuleArticle.php(67): Contao\Module->generate()
#13 system/modules/core/library/Contao/Controller.php(417): Contao\ModuleArticle->generate(false)
#14 system/modules/core/library/Contao/Controller.php(277): Contao\Controller::getArticle(Object(Contao\ArticleModel), false, false, 'main')
#15 system/modules/core/pages/PageRegular.php(133): Contao\Controller::getFrontendModule('0', 'main')
#16 system/modules/core/controllers/FrontendIndex.php(285): Contao\PageRegular->generate(Object(Contao\PageModel), true)
#17 index.php(20): Contao\FrontendIndex->run()
#18 {main}