Hi all

I've upgradet  from 4.9.5 to 5.3.1 with upgrade package. upgrade process seems be fine but when i try access the portal i get this error:

Server Error in '/' Application.

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Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: BC32206: Indirect reference is being made to assembly System.Web.Extensions version 3.5.0.0, which contains 'DotNetNuke.Web.UI.WebControls.DnnWindowManager'. This Project references a prior version of System.Web.Extensions version 1.0.61025.0. To use 'DotNetNuke.Web.UI.WebControls.DnnWindowManager', you must replace the reference to System.Web.Extensions with version 3.5.0.0 or higher.

Source Error:

Line 29:         <input id="ScrollTop" runat="server" name="ScrollTop" type="hidden" />
Line 30:         <input id="__dnnVariable" runat="server" name="__dnnVariable" type="hidden" />
Line 31:         <dnnui:DnnWindowManager ID="DnnWindowManager" runat="server" Visible="False"> Line 32:         </dnnui:DnnWindowManager>
Line 33:     </dnn:Form>

any suggestions?

sorry for my english

 Thanks for posting the solution ideas above.   I resolved the problem by copying all instances of the System.Web.Extensions namespace reference in the web.config file from the 'full install package' over the like instances in the current web.config file on the web server.  There were 9 or so instances to fix.