I have tried to edited a portal on our site that currently won't load any of its pages, throwing the page load exception- object not set to a reference. I have recently up graded to DNN 5.06 from 4.9 which is when this error started. I have checked the containers css, and ascx files. They all look correct.  I also have switched to different containers but the error still there. The entire portal has this problem and i can figure out why.

also the search isn't working.

Please Help!

here's the event viewer.

AssemblyVersion: 5.6.0
PortalID: 0
PortalName: www.TheGameHeadz.com
UserID: -1
UserName:
ActiveTabID: 673
ActiveTabName: Uncharted 2: Among Thieves
RawURL: /Default.aspx?tabid=673&error=Object+reference+not+set+to+an+instance+of+an+object.&content=0
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.google.co.uk/imgres?imgurl=http://i876.photobucket.com/albums/ab329/TheGameHeadz/Uncharted%25202/uncharted3-rumor-02.jpg&imgrefurl=http://n4g.com/news/clickout/633248&usg=__CnNwTMQ8lHIGdvESxKkG1Yk0h1c=&h=309&w=639&sz=44&hl=en&start=80&sig2=Cc9vCkjt3Y555nuo1MFE5g&zoom=1&tbnid=TdbSQnBQc8mdDM:&tbnh=99&tbnw=194&ei=lfIATYrCIYn94Aam3ZX0Ag&prev=/images%3Fq%3Duncharted%2B3%26um%3D1%26hl%3Den%26client%3Dfirefox-a%26sa%3DX%26rls%3Dorg.mozilla:en-US:official%26channel%3Ds%26biw%3D1024%26bih%3D578%26tbs%3Disch:10%2C27790%2C2779&um=1&itbs=1&iact=hc&vpx=510&vpy=315&dur=61&hovh=156&hovw=323&tx=167&ty=115&oei=5vEATbn2EY26hAerz4DuBw&esq=8&page=7&ndsp=16&ved=1t:429,r:10,s:80&biw=1024&bih=578
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.12) Gecko/20101026 Firefox/3.6.12
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 9b9d7718-5a84-4553-b151-4aed04f2972e
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.UI.Containers.ActionButtonList.get_ModuleActions
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.UI.Containers.ActionButtonList.get_ModuleActions() at DotNetNuke.UI.Containers.ActionButtonList.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.AddedControl(Control control, Int32 index) at System.Web.UI.ControlCollection.Add(Control child) at DotNetNuke.UI.Containers.ActionButton.CreateChildControls() at System.Web.UI.Control.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.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---
Source:
Server Name: IIS09402

Where would I look for this setting?  Also in the default container folder theres a No Containers.ascx - file. All of my other containers are currently working fine, aside from the search feature not functioning. 

I did notice that the two skins that are working have more code in them than the one that didn't. was a problem with the container file. I have three container designs. My design Blank.ascx  for this page type was missing some code. So i just copied the design from the working portals and the pages loaded no problem.

thanks again for the help