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Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method simple_breaks::add_button() cannot be called statically in /var/www/kasperaae.com/public_html/wp-includes/class-wp-hook.php:324 Stack trace: #0 /var/www/kasperaae.com/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #1 /var/www/kasperaae.com/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #2 /var/www/kasperaae.com/public_html/wp-settings.php(704): do_action('init') #3 /var/www/kasperaae.com/public_html/wp-config.php(90): require_once('/var/www/kasper...') #4 /var/www/kasperaae.com/public_html/wp-load.php(50): require_once('/var/www/kasper...') #5 /var/www/kasperaae.com/public_html/wp-blog-header.php(13): require_once('/var/www/kasper...') #6 /var/www/kasperaae.com/public_html/index.php(17): require('/var/www/kasper...') #7 {main} thrown in /var/www/kasperaae.com/public_html/wp-includes/class-wp-hook.php on line 324