Why am I getting these messages in error_log: WordPress

Why am I getting these messages in error_log:

WordPress database error Table 'xxxxxxx.wp_11_mm_conversation' doesn't exist for query ALTER TABLE wp_11_mm_conversation ADD COLUMN status INT(11) DEFAULT 1; made by require_once('wp-load.php'), require_once('/home/xxxxxxx/wp-config.php'), require_once('wp-settings.php'), do_action('wp_loaded'), call_user_func_array, MM_Upgrade_Controller->check, MM_Upgrade_Controller->fix_column_name