warning: Missing argument 2 for drupal_get_form() in /usr/home/virtual/riseandruin.com/webroot/htdocs/dev.riseandruin.com/includes/form.inc on line 61.

Using Drupal 4.7.8 with Skipcart 1.7

skipcart.module calls the drupal_get_form() function three times with one argument. With how form.inc is coded, I cannot see why this is causing an error. The installation was successful.

$form = drupal_get_form('checkout_form');

Are there any dependencies that SkipCart requires? Do any known modules conflict with the functionality of SkipCart -- the error was linked to previous modules conflicting with modules other than SkipCart?