Server Error in '/Class Campers Web 2.0' Application.

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[ArgumentException: Item has already been added. Key in dictionary: 'RegEx'  Key being added: 'RegEx']
   System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) +7482408
   System.Collections.Hashtable.Add(Object key, Object value) +11
   System.Configuration.Provider.ProviderCollection.Add(ProviderBase provider) +78
   UrlRewritingNet.Configuration.Provider.UrlRewritingProviderCollection.Add(ProviderBase provider) +43
   UrlRewritingNet.Web.UrlRewriting.Initialize() +184
   UrlRewritingNet.Web.UrlRewriting.CreateRewriteRule(String providerName) +16
   UrlRewritingNet.Web.UrlRewriteModule.Init(HttpApplication context) +228
   System.Web.HttpApplication.InitModulesCommon() +65
   System.Web.HttpApplication.InitModules() +43
   System.Web.HttpApplication.InitInternal(HttpContext context, HttpApplicationState state, MethodInfo[] handlers) +729
   System.Web.HttpApplicationFactory.GetNormalApplicationInstance(HttpContext context) +298
   System.Web.HttpApplicationFactory.GetApplicationInstance(HttpContext context) +107
   System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +289