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Access to this page requires authorization. You can try changing directories.
After I created a Report and then tried to add the report in SharePoint Report viewer web part, this page may be shown with the following error: "**Session state has been disabled for ASP.NET. **
The Report Viewer control requires that session state be enabled in local mode".
To resolve this error open the Sharepoint PowerShell as administrator and run the following command "Enable-SPSessionStateService -Defaultprovision ".
It worked for me; hope it will help you too!