Server Error in '/' Application.

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[ArgumentException: Object must be of type String.]
   System.Globalization.CompareInfo.InternalGetGlobalizedHashCode(IntPtr handle, IntPtr handleOrigin, String localeName, String source, Int32 length, Int32 dwFlags, Boolean forceRandomizedHashing, Int64 additionalEntropy) +0
   System.Globalization.CompareInfo.GetHashCodeOfString(String source, CompareOptions options, Boolean forceRandomizedHashing, Int64 additionalEntropy) +126
   System.CultureAwareComparer.GetHashCode(String obj) +89
   System.Collections.Hashtable.InitHash(Object key, Int32 hashsize, UInt32& seed, UInt32& incr) +21
   System.Collections.Hashtable.get_Item(Object key) +80
   System.Collections.Specialized.NameObjectCollectionBase.BaseAdd(String name, Object value) +95
   System.Web.HttpApplication.BuildIntegratedModuleCollection(List`1 moduleList) +276
   System.Web.HttpApplication.InitInternal(HttpContext context, HttpApplicationState state, MethodInfo[] handlers) +1089
   System.Web.HttpApplicationFactory.GetNormalApplicationInstance(HttpContext context) +232
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +360