Server Error in '/' Application.

---

[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) +76
   System.CultureAwareComparer.GetHashCode(String obj) +72
   System.StringComparer.GetHashCode(Object obj) +44
   System.Collections.Hashtable.GetHash(Object key) +17
   System.Collections.Hashtable.get_Item(Object key) +54
   System.Collections.Specialized.NameObjectCollectionBase.BaseAdd(String name, Object value) +70
   System.Web.HttpApplication.BuildIntegratedModuleCollection(List`1 moduleList) +206
   System.Web.HttpApplication.InitInternal(HttpContext context, HttpApplicationState state, MethodInfo[] handlers) +824
   System.Web.HttpApplicationFactory.GetNormalApplicationInstance(HttpContext context) +209
   System.Web.HttpApplicationFactory.GetApplicationInstance(HttpContext context) +113
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +342