[ArgumentNullException: 值不能为空。
参数名: value]
   System.Web.Caching.CacheEntry..ctor(String key, Object value, CacheDependency dependency, CacheItemRemovedCallback onRemovedHandler, DateTime utcAbsoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, Boolean isPublic) +8952139
   System.Web.Caching.CacheInternal.DoInsert(Boolean isPublic, String key, Object value, CacheDependency dependencies, DateTime utcAbsoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, CacheItemRemovedCallback onRemoveCallback, Boolean replace) +93
   System.Web.Caching.Cache.Insert(String key, Object value) +83
   URLRewriter.Config.RewriterConfiguration.GetConfig() +130
   URLRewriter.RewriterFactoryHandler.GetHandler(HttpContext context, String requestType, String url, String pathTranslated) +119
   System.Web.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +307
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155