Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string (--) at position 0 (-): Unexpected character in /homepages/35/d124302392/htdocs/app124302415/wp-content/plugins/the-holiday-calendar/helpers/helper.class.php:156 Stack trace: #0 /homepages/35/d124302392/htdocs/app124302415/wp-content/plugins/the-holiday-calendar/helpers/helper.class.php(156): DateTime->__construct('--') #1 /homepages/35/d124302392/htdocs/app124302415/wp-content/plugins/the-holiday-calendar/helpers/string-helper.class.php(30): thc_helper::formatDate('') #2 /homepages/35/d124302392/htdocs/app124302415/wp-content/plugins/the-holiday-calendar/the-holiday-calendar.php(229): thc_string_helper::convert_dates_to_single_line('2015-02-13', '', '', '') #3 /homepages/35/d124302392/htdocs/app124302415/wp-includes/class-wp-hook.php(287): the_holiday_calendar::override_title('Unser Sommerurl...', 1081) #4 /homepages/35/d124302392/htdocs/app124302415/wp-includes/plugin.php(206): WP_Hook->apply_filters('Unser Sommerurl...', Array) #5 /ho in /homepages/35/d124302392/htdocs/app124302415/wp-content/plugins/the-holiday-calendar/helpers/helper.class.php on line 156