Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string (--) at position 0 (-): Unexpected character in /www/htdocs/w012d2b8/grundschule-contwig.de/wp-content/plugins/the-holiday-calendar/helpers/helper.class.php:156 Stack trace: #0 /www/htdocs/w012d2b8/grundschule-contwig.de/wp-content/plugins/the-holiday-calendar/helpers/helper.class.php(156): DateTime->__construct('--') #1 /www/htdocs/w012d2b8/grundschule-contwig.de/wp-content/plugins/the-holiday-calendar/helpers/string-helper.class.php(19): thc_helper::formatDate('') #2 /www/htdocs/w012d2b8/grundschule-contwig.de/wp-content/plugins/the-holiday-calendar/the-holiday-calendar.php(230): thc_string_helper::convert_dates_to_single_line('', '', '', '') #3 /www/htdocs/w012d2b8/grundschule-contwig.de/wp-includes/class-wp-hook.php(308): the_holiday_calendar::override_title('Sitzung des F\xC3\xB6...', 8062) #4 /www/htdocs/w012d2b8/grundschule-contwig.de/wp-includes/plugin.php(205): WP_Hook->apply_filters('Sitzung des F\xC3\xB6...', Array) #5 /www/ht in /www/htdocs/w012d2b8/grundschule-contwig.de/wp-content/plugins/the-holiday-calendar/helpers/helper.class.php on line 156