Error while Launching Biz-Desk

Hi, 
  I have installed Biz-desk from a pup file. When I try to browse
default.aspx from IIS, I get an exception saying 'Invalid object name'
Decode. Error in line 126 in global.asa. Please find below the line in
global.asa which is referred in the error message.
		' -- initialize AppConfig instance for the current site
		set MSCSAppConfig = server.CreateObject("Commerce.AppConfig")
		MSCSAppConfig.Initialize MSCSSiteName
		set Application("MSCSAppConfig")	= MSCSAppConfig


What is the solution to the above problem. Please assit. 
Thanks in advance