start Date could not be converted to date object.Check date and global timezone.

bool(false) object(DateTimeZone)#2381 (2) { ["timezone_type"]=> int(3) ["timezone"]=> string(13) "Europe/Berlin" }
Warning: date_time_set() expects parameter 1 to be DateTime, bool given in /var/www/web194/html/wordpress/wp-content/plugins/amr-ical-events-list/includes/amr-ical-events-list-main.php on line 2122

Error: Start data of range is not a date object. Please advise administrator

bool(false)
Warning: date_modify() expects parameter 1 to be DateTime, null given in /var/www/web194/html/wordpress/wp-content/plugins/amr-ical-events-list/includes/amr-ical-events-list-main.php on line 2149

Warning: date_modify() expects parameter 1 to be DateTime, null given in /var/www/web194/html/wordpress/wp-content/plugins/amr-ical-events-list/includes/amr-ical-events-list-main.php on line 2152

Fatal error: Uncaught Error: __clone method called on non-object in /var/www/web194/html/wordpress/wp-content/plugins/amr-ical-events-list/includes/amr-ical-events-list-main.php:1450 Stack trace: #0 /var/www/web194/html/wordpress/wp-content/plugins/amr-ical-events-list/includes/amr-ical-events-list-main.php(1696): amr_process_icalevents(Array, false, NULL, '3') #1 /var/www/web194/html/wordpress/wp-content/plugins/amr-ical-events-list/includes/amr-ical-events-list-main.php(2218): amr_process_icalspec(Array, false, NULL, '3') #2 /var/www/web194/html/wordpress/wp-includes/shortcodes.php(433): amr_do_ical_shortcode(Array, '', 'ical') #3 [internal function]: do_shortcode_tag(Array) #4 /var/www/web194/html/wordpress/wp-includes/shortcodes.php(273): preg_replace_callback('/\\[(\\[?)(ical)(...', 'do_shortcode_ta...', '<div>\r\n\r\n[ical ...') #5 /var/www/web194/html/wordpress/wp-content/plugins/sport-core-plugin/inc/blocks/block_text_section_output.php(35): do_shortcode('<div>\r\n\r\n[ical ...') #6 /var/www/web194/html/wordpress/ in /var/www/web194/html/wordpress/wp-content/plugins/amr-ical-events-list/includes/amr-ical-events-list-main.php on line 1450