Discout Code error

[snazzytr]

I'm getting this code:

 

1146 - Table 'snazzytr_osc6.discount_coupons' doesn't exist

 

select count(*) as total from discount_coupons cd

 

everytime I go into the Discount Code section on my Administration area

 

and when I try to pay for items through my site this error comes up around payment/confirmation stage

Warning: require_once(includes/classes/discount_coupon.php) [function.require-once]: failed to open stream: No such file or directory in /home/snazzytr/public_html/checkout_confirmation.php on line 84

 

Fatal error: require_once() [function.require]: Failed opening required 'includes/classes/discount_coupon.php' (include_path='.:/usr/local/php52/pear') in /home/snazzytr/public_html/checkout_confirmation.php on line 84

 

Any idea how to solve this?

thanks