Just a little reminder that if you install the OpsMgr web console after the UI console has already been installed you will need to Copy the following files from the %Program Files%\System Center Operations Manager 2007 directory to the %Program Files%\System Center Operations Manager 2007\Web Console\Bin directory:   Corgent.Diagramming.CommandResources.dll Corgent.Diagramming.CustomElements.dll Microsoft.ReportViewer.Common.dll Microsoft.ReportViewer.Webforms.dll   Otherwise you will get...(read more)

Read the complete post at http://scug.be/blogs/scom/archive/2009/12/02/opsmgr-webconsole-runtime-error-server-error-in-application.aspx