Server Error in '/' 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) +2904181
   System.Collections.Hashtable.Add(Object key, Object value) +11
   System.Configuration.Provider.ProviderCollection.Add(ProviderBase provider) +75
   UrlRewritingNet.Configuration.Provider.UrlRewritingProviderCollection.Add(ProviderBase provider) +40
   UrlRewritingNet.Web.UrlRewriting.Initialize() +181
   UrlRewritingNet.Web.UrlRewriting.CreateRewriteRule(String providerName) +13
   UrlRewritingNet.Web.UrlRewriteModule.Init(HttpApplication context) +217
   System.Web.HttpApplication.InitModulesCommon() +66
   System.Web.HttpApplication.InitInternal(HttpContext context, HttpApplicationState state, MethodInfo[] handlers) +1006
   System.Web.HttpApplicationFactory.GetNormalApplicationInstance(HttpContext context) +259
   System.Web.HttpApplicationFactory.GetApplicationInstance(HttpContext context) +114
   System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +350