getting a mysql type error, can some one help me out

hey i have installed the e-commerce module, but when activating the cart module i get this warning

"user warning: Table 'showlcom_d.ec_cart' doesn't exist query: SELECT c.*, n.title, n.vid FROM node n INNER JOIN ec_cart c ON n.nid = c.nid WHERE c.cookie_id = '1' in /home/showlcom/public_html/includes/database.mysql.inc on line 172."

here showlcom is the name of my database and here is the list of ecommerce modules i have activated...

* Token

* Mail Subsystem
* Product API
* Anonymous purchasing

* Store
* Cart
* Payment API

can someone tell me whats is going wrong ..... and if you require any other information plz let me know... thx in advance...