When the user click at "New Thread", he get a "Object reference not set to an instance of an object" error. 

What can I do?

AssemblyVersion: 04.03.05
PortalID: 0
PortalName: Comunidade Eu Jogo War na Gametrack
UserID: 3
UserName: reinaldo_mra
ActiveTabID: 36
ActiveTabName: Home
RawURL: /warhomepage/Default.aspx?tabid=36&error=Object+reference+not+set+to+an+instance+of+an+object.
AbsoluteURL: /warhomepage/Default.aspx
AbsoluteURLReferrer: http://localhost/warhomepage/Home/tabid/36/forumid/1/scope/threads/Default.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; FunWebProducts; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 0abe37c0-0dc6-43e1-a2cd-cb5e6e272ccc
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Modules.Forum.ForumInfo.Render
StackTrace:
Message: System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Modules.Forum.ForumInfo.Render(HtmlTextWriter wr, DNNForum Forum, Int32 Count)
Source:
Server Name: WORK29

I was using Locale Portuguese.

I am amaze with dotnetnuke. But I think that he is too much unstable. Maybe there is a trouble at the current version (4.3.5).

I deleted everything and reinstalled. Now I am working using English Locale. After many tries (add, setting and delete Forum Module) I can use forum.

But it is too weird. Sometimes the things working fine, sometimes not. It´s too unstable.

Other weird trouble. Sometimes the statistics is visibled, sometimes not.  The behavior changes without change the settings. I can´t understand that.

But I amaze with dotnetnuke. I will invest my time on it.

Another example of unstable. Yesteday the site was working fine. Today, when I accessed it for the first time I got the error bellow. The error didn't repeat again.

Thanks,

AssemblyVersion: 04.03.05
PortalID: 0
PortalName: Comunidade Eu Jogo War na Gametrack
UserID: -1
UserName:
ActiveTabID: 36
ActiveTabName: Home
RawURL: /DotNetNuke_2/Default.aspx
AbsoluteURL: /DotNetNuke_2/Default.aspx
AbsoluteURLReferrer:
UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; FunWebProducts; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 6eb3375d-d3b2-4060-a811-994298ff9500
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Modules.Forum.Groups.CreateChildControls
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Modules.Forum.Groups.CreateChildControls() at DotNetNuke.Modules.Forum.DNNForum.CreateChildControls() at System.Web.UI.Control.EnsureChildControls() at DotNetNuke.Modules.Forum.ForumBaseControl.EnsureChildControls() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---
Source:
Server Name: WORK29