Server Error in '/' Application.

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[OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.]
   System.Collections.Hashtable.rehash(Int32 newsize, Boolean forceNewHashCode) +32
   System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) +13133942
   System.Collections.Hashtable.Add(Object key, Object value) +16
   System.Web.Caching.CacheSingle.UpdateCache(CacheKey cacheKey, CacheEntry newEntry, Boolean replace, CacheItemRemovedReason removedReason, Object& valueOld) +797
   System.Web.Caching.CacheMultiple.UpdateCache(CacheKey cacheKey, CacheEntry newEntry, Boolean replace, CacheItemRemovedReason removedReason, Object& valueOld) +55
   System.Web.Caching.CacheInternal.DoInsert(Boolean isPublic, String key, Object value, CacheDependency dependencies, DateTime utcAbsoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, CacheItemRemovedCallback onRemoveCallback, Boolean replace) +118
   System.Web.Caching.AspNetCache.Insert(String key, Object item, CacheInsertOptions options) +108
   System.Web.SessionState.InProcSessionStateStore.SetAndReleaseItemExclusive(HttpContext context, String id, SessionStateStoreData item, Object lockId, Boolean newItem) +868
   System.Web.SessionState.SessionStateModule.OnReleaseState(Object source, EventArgs eventArgs) +589
   System.Web.SessionState.SessionStateModule.OnEndRequest(Object source, EventArgs eventArgs) +9947872
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +144
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +50
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +73