Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method ultimate_follow_me::register() cannot be called statically in /homepages/46/d410832686/htdocs/wp-includes/class-wp-hook.php:307
Stack trace:
#0 /homepages/46/d410832686/htdocs/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#1 /homepages/46/d410832686/htdocs/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#2 /homepages/46/d410832686/htdocs/wp-includes/widgets.php(1854): do_action('widgets_init')
#3 /homepages/46/d410832686/htdocs/wp-includes/class-wp-hook.php(307): wp_widgets_init('')
#4 /homepages/46/d410832686/htdocs/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#5 /homepages/46/d410832686/htdocs/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#6 /homepages/46/d410832686/htdocs/wp-settings.php(587): do_action('init')
#7 /homepages/46/d410832686/htdocs/wp-config.php(90): require_once('/homepages/46/d...')
#8 /homepages/46/d410832686/htdocs/wp-load.php(50): require_once('/homepages/46/d...')
#9 /homepages/46/d410832686/htdocs/wp-blog-header.php(13): require_once('/homepages/46/d...')
#10 /homepages/46/d410832686/htdocs/index.php(17): require('/homepages/46/d...')
#11 {main}
thrown in /homepages/46/d410832686/htdocs/wp-includes/class-wp-hook.php on line 307