OSCOMMERCE mod error

Tried to install Discount Coupon Codes 2.0 Errors are occuring: Warning: main(/home/wwwscar/public_html/osc/catalog/includes/languages/english/modules/order_total/[login to view URL]): failed to open stream: No such file or directory in /home/wwwscar/public_html/osc/catalog/admin/[login to view URL] on line 128 Warning: main(/home/wwwscar/public_html/osc/catalog/includes/languages/english/modules/order_total/[login to view URL]): failed to open stream: No such file or directory in /home/wwwscar/public_html/osc/catalog/admin/[login to view URL] on line 128 Warning: main(): Failed opening '/home/wwwscar/public_html/osc/catalog/includes/languages/english/modules/order_total/[login to view URL]' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/wwwscar/public_html/osc/catalog/admin/[login to view URL] on line 128 Warning: Missing argument 1 for discount_coupon() in /home/wwwscar/public_html/osc/catalog/includes/modules/order_total/[login to view URL] on line 18 Fatal error: Call to undefined function: check() in /home/wwwscar/public_html/osc/catalog/admin/[login to view URL] on line 134