Error Finding Configuration File: 

Can't locate D:/Web_City/Ydream3D/cgi-bin/e-cart/e-cart-config.pl in @INC (@INC contains: C:/Perl/lib C:/Perl/site/lib .) at D:\Demeter\Drive_D\Web_City\yDream3D\cgi-bin\e-cart\addcart.pl line 84.

Make sure the configuration file is in this directory.
You may need to set the path in the require statement.