Solution for following error:I had to install SharePoint Foundation 2010 for a new project. They needed a native Web Part, and the name of this was Report Viewer controlBut a received a strange correlation-ID error and I could not open anymore my site. so I opened ULSVIEWER and got a stranger error: Session state has been disabled for ASP.NET. The Report Viewer control requires that session state be enabled in local modeSo I made...
