Could not load file or assembly 'System.Web.Silverlight' or one of its dependencies

I am a newbee to Sil开发者_如何学Cverlight and I am on it as I have inherited a sharepoint site that "used to" use Silverlight 2. I say "Used to" because the object tag in live .aspx pages says PARAM NAME="minRuntimeVersion" VALUE="2.0.31005.0". For some reason the development environment now produces param name="minRuntimeVersion" value="3.0.40818.0" so I think the development environment has moved on to the next version. Now my problem is that I am not able to deploy any new build of the .xap files to the production environment even if I change the whole silverlight object in the UI. Any help would be much appreciated.

BTW, I get the following erro: An error occurred during the processing of . Could not load file or assembly 'System.Web.Silverlight' or one of its dependencies. The system cannot find the file specified.

I can confirm the production environment has been updated with the newer version of Silverlight

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System.Web.Silverlight for v2.0 is under

%programfiles%\Microsoft SDKs\Silverlight\v2.0\Libraries\Server\

but this assembly has been removed from the Silverlight SDK for Silverlight 3, you should use object tag instead, see this for more detail and also see How to: Add Silverlight to a Web Page by Using HTML