Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method wpb_mc::init() cannot be called statically in /homepages/24/d448825772/htdocs/motoroad/wp-includes/class-wp-hook.php:308
Stack trace:
#0 /homepages/24/d448825772/htdocs/motoroad/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array)
#1 /homepages/24/d448825772/htdocs/motoroad/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#2 /homepages/24/d448825772/htdocs/motoroad/wp-settings.php(617): do_action('init')
#3 /homepages/24/d448825772/htdocs/motoroad/wp-config.php(98): require_once('/homepages/24/d...')
#4 /homepages/24/d448825772/htdocs/motoroad/wp-load.php(50): require_once('/homepages/24/d...')
#5 /homepages/24/d448825772/htdocs/motoroad/wp-blog-header.php(13): require_once('/homepages/24/d...')
#6 /homepages/24/d448825772/htdocs/motoroad/index.php(17): require('/homepages/24/d...')
#7 {main}
thrown in /homepages/24/d448825772/htdocs/motoroad/wp-includes/class-wp-hook.php on line 308