Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "TEC\Events_Pro\Custom_Tables\V1\Activation" not found in /var/www/vhosts/rckilmarnock.org.uk/httpdocs/wp-includes/class-wp-hook.php:353 Stack trace: #0 /var/www/vhosts/rckilmarnock.org.uk/httpdocs/wp-includes/class-wp-hook.php(377): WP_Hook->apply_filters() #1 /var/www/vhosts/rckilmarnock.org.uk/httpdocs/wp-includes/plugin.php(523): WP_Hook->do_action() #2 /var/www/vhosts/rckilmarnock.org.uk/httpdocs/wp-settings.php(779): do_action() #3 /var/www/vhosts/rckilmarnock.org.uk/httpdocs/wp-config.php(103): require_once('...') #4 /var/www/vhosts/rckilmarnock.org.uk/httpdocs/wp-load.php(50): require_once('...') #5 /var/www/vhosts/rckilmarnock.org.uk/httpdocs/wp-blog-header.php(13): require_once('...') #6 /var/www/vhosts/rckilmarnock.org.uk/httpdocs/index.php(17): require('...') #7 {main} thrown in /var/www/vhosts/rckilmarnock.org.uk/httpdocs/wp-includes/class-wp-hook.php on line 353