Hi, I am receiving this error message which has been discussed previously.  It was supposedly fixed in 4.4.5.  I am on 4.5.3 with Forum 4.4.3. It has now happened twice over the last month.  I am concerned because we run competitions through the forums to encourage people to participate. The site is hosted in US with iHostasp.

I have two problems to solve, firstly, to fix the problem at hand and secondly do so without losing the previous entries.  Help me please.....

The stack trace is below:

[ArgumentNullException: Value cannot be null.
Parameter name: value]
   System.Web.Caching.CacheEntry..ctor(String key, Object value, CacheDependency dependency, CacheItemRemovedCallback onRemovedHandler, DateTime utcAbsoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, Boolean isPublic) +3599655
   System.Web.Caching.CacheInternal.DoInsert(Boolean isPublic, String key, Object value, CacheDependency dependencies, DateTime utcAbsoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority priority, CacheItemRemovedCallback onRemoveCallback, Boolean replace) +88
   System.Web.Caching.Cache.Insert(String key, Object value, CacheDependency dependencies) +85
   DotNetNuke.Services.Cache.FileBasedCachingProvider.FBCachingProvider.Insert(String CacheKey, Object objObject, Boolean PersistAppRestart) +159
   DotNetNuke.Common.Utilities.DataCache.SetCache(String CacheKey, Object objObject) +35
   DotNetNuke.Modules.Forum.ThreadInfo.GetThreadInfo(Int32 ThreadID) +102
   DotNetNuke.Modules.Forum.Posts..ctor(DNNForum forum) +598
   DotNetNuke.Modules.Forum.DNNForum.CreateObject() +183
   DotNetNuke.Modules.Forum.DNNForum.CreateChildControls() +12
   System.Web.UI.Control.EnsureChildControls() +87
   DotNetNuke.Modules.Forum.ForumBaseControl.EnsureChildControls() +25
   DotNetNuke.Modules.Forum.DNNForum.Initialize() +11
   DotNetNuke.Modules.Forum.ForumBaseControl.OnLoad(EventArgs e) +7
   System.Web.UI.Control.LoadRecursive() +47
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1436

[PageLoadException: Value cannot be null.
Parameter name: value]
   DotNetNuke.Services.Exceptions.Exceptions.ProcessPageLoadException(Exception exc, String URL) +377
   DotNetNuke.Framework.PageBase.Page_Error(Object Source, EventArgs e) +484
   System.Web.UI.TemplateControl.OnError(EventArgs e) +2085460
   System.Web.UI.Page.HandleError(Exception e) +71
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +7341
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +213
   System.Web.UI.Page.ProcessRequest() +86
   System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +18
   System.Web.UI.Page.ProcessRequest(HttpContext context) +49
   ASP.default_aspx.ProcessRequest(HttpContext context) +4
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +358
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64