未捕获错误:调用/wp-include /wp-db.php:1570中的未定义函数mysql_connect()

I am in big trouble. I installed a nulled version of woocommerce cart based shipping plugin and i found it not relevant according to my requiremnet and deleted that plugin from plugins area. After deleting that plugin my site went down. Its continuously showing me Fatal error:I am in big trouble. I installed a nulled versi