Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "_wp_footnotes_kses_init" not found or invalid function name in /var/www/seriousplay.training/seriousplay.community/education/wp-includes/class-wp-hook.php:307 Stack trace: #0 /var/www/seriousplay.training/seriousplay.community/education/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array) #1 /var/www/seriousplay.training/seriousplay.community/education/wp-includes/plugin.php(474): WP_Hook->do_action(Array) #2 /var/www/seriousplay.training/seriousplay.community/education/wp-includes/pluggable.php(48): do_action('set_current_use...') #3 /var/www/seriousplay.training/seriousplay.community/education/wp-includes/user.php(3363): wp_set_current_user(0) #4 /var/www/seriousplay.training/seriousplay.community/education/wp-includes/pluggable.php(70): _wp_get_current_user() #5 /var/www/seriousplay.training/seriousplay.community/education/wp-includes/class-wp.php(624): wp_get_current_user() #6 /var/www/seriousplay.training/seriousplay.community/education/wp-settings.php(574): WP->init() #7 /var/www/seriousplay.training/seriousplay.community/education/wp-config.php(88): require_once('/var/www/seriou...') #8 /var/www/seriousplay.training/seriousplay.community/education/wp-load.php(50): require_once('/var/www/seriou...') #9 /var/www/seriousplay.training/seriousplay.community/education/wp-blog-header.php(13): require_once('/var/www/seriou...') #10 /var/www/seriousplay.training/seriousplay.community/education/index.php(17): require('/var/www/seriou...') #11 {main} thrown in /var/www/seriousplay.training/seriousplay.community/education/wp-includes/class-wp-hook.php on line 307