ASP.NET session has expired strange error

I have ReportViewer controls on several Visual Studio 2008 pages and whenever I choose a radio button to run the report, I immediately get an "ASP.NET session has expired" error right in the report viewer where the report should be showing up.  The error is in just plain text, it is not the full screen ASP.NET session has expired error.

I do not think this is an issue with the session tiemout value in IIS as this error occurs immediately after I open a webpage and not after a period of time.  I am running IIS 6 and I have the maximum number of worker processes in the web garden set to 1 in the Application Pool.  The session timeout in the website that is beign used is set to 60 minutes.
zintechAsked:
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Obadiah ChristopherConnect With a Mentor Commented:
Does this happen in only IE or all browsers?

Have you installed any addons in IE? If yes, try disabling them and try again.
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Daniel Van Der WerkenIndependent ConsultantCommented:
What does the event viewer and your IIS and application logs show?
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zintechAuthor Commented:
The solution appeared to be to go into the web.config file and add the property "Cookieless=true"
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