Pb Installation with Umbraco

Hi,

I installed nopCommerce with Web Platform Installer2.0, after having installed Umbraco.

Here is the error when I tried to launch nopCommerce install.aspx or default.aspx :

Impossible to charge type 'umbraco.presentation.requestModule'. (E:\...\Umbraco\web.config line 85)

Ligne 83 :       <!-- URL REWRTIER -->
Ligne 84 :       <add name="UrlRewriteModule" type="UrlRewritingNet.Web.UrlRewriteModule, UrlRewritingNet.UrlRewriter" />
Ligne 85 :       <add name="umbracoRequestModule" type="umbraco.presentation.requestModule" />
Ligne 86 :       <!-- UMBRACO -->
Ligne 87 :       <add name="viewstateMoverModule" type="umbraco.presentation.viewstateMoverModule" />

source file : E:\...\Umbraco\web.config    Ligne : 85


What must I change... or may be something missing in the intall.

Thanks
Phil