New Post: Cant add products to product list

Hi, This is the first time i m using DNN, basically i want to create an eCommerce portal. I have installed the NB_store for doing the same. I have make the drag and drop the NB_product list from the module in superuser account but when i tried to add the product into the list it came up with an error 0x80070002. I was also wondering if i can get a tutorial video or some steps to make the portalwith the help of using nb_store. Please Help.

Detailed Error Information
Module IIS Web Core
Notification MapRequestHandler
Handler StaticFile
Error Code 0x80070002
Requested URL http://localhost:80/dotnetnuke/Host/Tes-tPage/ctl/AdminProduct/mid/432/ProdId/0/RtnTab/89/PageIndex/1/CatID/-1/portalid/0?SkinSrc=/dotnetnuke/DesktopModules/NB_Store/Skins/Dark/Edit
Physical Path C:\inetpub\wwwroot\dotnetnuke\Host\Tes-tPage\ctl\AdminProduct\mid\432\ProdId\0\RtnTab\89\PageIndex\1\CatID-1\portalid\0
Logon Method Forms
Logon User host