Ad dosen't Add to Cart

Hi,

I've got Ad Ubercart setup with both monthly and daily products. When i try to add either to cart i get a series of errors;

warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'ad_adbard_node_form' was given in /Applications/MAMP/htdocs/drupal/includes/form.inc on line 378.
warning: Invalid argument supplied for foreach() in /Applications/MAMP/htdocs/drupal/sites/all/modules/ad_ubercart/ad_ubercart.forms.inc on line 500.
warning: array_unshift() [function.array-unshift]: The first argument should be an array in /Applications/MAMP/htdocs/drupal/sites/all/modules/ad_ubercart/ad_ubercart.forms.inc on line 508.
warning: array_merge() [function.array-merge]: Argument #1 is not an array in /Applications/MAMP/htdocs/drupal/sites/all/modules/ad_ubercart/ad_ubercart.forms.inc on line 509.

How could i solve this? Im not much of coder :(