Quando installo il forum di ASP.NET ottengo questo errore

Server Error in '/AspNetForums' Application.
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Impossibile risolvere il conflitto di regole di confronto per l'operazione equal to.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: Impossibile risolvere il conflitto di regole di confronto per l'operazione equal to.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[SqlException: Impossibile risolvere il conflitto di regole di confronto per l'operazione equal to.]
System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream) +723
System.Data.SqlClient.SqlCommand.ExecuteReader() +41
AspNetForums.Data.SqlDataProvider.GetSiteStatistics() +109
AspNetForums.Components.Statistics.GetSiteStatistics() +120
AspNetForums.Controls.SiteStats.InitializeSkin(Control skin) +20
AspNetForums.Controls.SkinnedForumWebControl.CreateChildControls() +24
System.Web.UI.Control.EnsureChildControls() +100
System.Web.UI.Control.PreRenderRecursiveInternal() +38
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Page.ProcessRequestMain() +1489




per quale motivo? Grazie