Stopped working after upgrade

Thanks for the great plugin. I’m sad to report after the latest upgrade all the posts disappeared from the timeline. I turned on debugging and saw: Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method WPSimileTimelineLoader::init() should not be called statically in /srv/www/wordpress-default/wp-includes/plugin.php on line 503 Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method WPSimileTimelineLoader::addPostPanelEventDates() should not be called statically in /srv/www/wordpress-default/wp-includes/plugin.php on line 503 Strict Standards: Non-static method WPSimileTimelineLoader::loadPlugin() should not be called statically in /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/timeline.php on line 209 Strict Standards: Non-static method WPSimileTimeline::construct() should not be called statically in /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/timeline.php on line 85 Strict Standards: Non-static method WPSimileTimeline::singleton() should not be called statically in /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/timeline.php on line 210 Strict Standards: Non-static method WPSimileTimelineToolbox::getCustomPostTypes() should not be called statically in /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/timeline.php on line 217 Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method WPSimileTimelineLoader::registerOptionsPage() should not be called statically in /srv/www/wordpress-default/wp-includes/plugin.php on line 503 Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method WPSimileTimelineAdmin::registerAdminScripts() should not be called statically in /srv/www/wordpress-default/wp-includes/plugin.php on line 503 Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method WPSimileTimelinePost::updateEventDates() should not be called statically in /srv/www/wordpress-default/wp-includes/plugin.php on line 503 Strict Standards: Non-static method WPSimileTimelinePost::saveEventDate() should not be called statically in /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/inc/WPSimileTimelinePost.class.php on line 128 Strict Standards: Non-static method WPSimileTimelinePost::saveEventDate() should not be called statically in /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/inc/WPSimileTimelinePost.class.php on line 129 Strict Standards: Non-static method WPSimileTimelinePost::saveEventDate() should not be called statically in /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/inc/WPSimileTimelinePost.class.php on line 130 Strict Standards: Non-static method WPSimileTimelinePost::saveEventDate() should not be called statically in /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/inc/WPSimileTimelinePost.class.php on line 131 Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method WPSimileTimelinePost::updateEventDates() should not be called statically in /srv/www/wordpress-default/wp-includes/plugin.php on line 503 Strict Standards: Non-static method WPSimileTimelinePost::saveEventDate() should not be called statically in /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/inc/WPSimileTimelinePost.class.php on line 128 Strict Standards: Non-static method WPSimileTimelinePost::saveEventDate() should not be called statically in /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/inc/WPSimileTimelinePost.class.php on line 129 Strict Standards: Non-static method WPSimileTimelinePost::saveEventDate() should not be called statically in /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/inc/WPSimileTimelinePost.class.php on line 130 Strict Standards: Non-static method WPSimileTimelinePost::saveEventDate() should not be called statically in /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/inc/WPSimileTimelinePost.class.php on line 131 Warning: Cannot modify header information – headers already sent by (output started at /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/inc/WPSimileTimelinePost.class.php:129) in /srv/www/wordpress-default/wp-admin/post.php on line 242 Warning: Cannot modify header information – headers already sent by (output started at /srv/www/wordpress-default/wp-content/plugins/wp-simile-timeline/inc/WPSimileTimelinePost.class.php:129) in /srv/www/wordpress-default/wp-includes/pluggable.php on line 1207 Unfortunately I don’t have time right now to debug your code, but hopefully this gets you started. https://wordpress.org/plugins/wp-simile-timeline/