Custom Forms Authentication reporting Services 2008 r2

I have implemented the sample forms authentication for sql server2008 r2.. I am able to create the users and when i logging with the database user which in the table it i am getting this error..

Can anyone please help..

ui!ReportManager_0-1!13bc!10/04/2011-12:15:33:: e ERROR: Microsoft.ReportingServices.UI.FolderPage+InsufficientPermissionsToRoot: User '' does not have required permissions. Verify that sufficient permissions have been granted and Windows User Account Control (UAC) restrictions have been addressed.
   at Microsoft.ReportingServices.UI.FolderPage.Page_Init(Object sender, EventArgs e)
   at System.EventHandler.Invoke(Object sender, EventArgs e)
   at System.Web.UI.Control.OnInit(EventArgs e)
   at System.Web.UI.Page.OnInit(EventArgs e)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
library!ReportServer_0-2!1ec4!10/04/2011-12:15:33:: Call to GetSystemPermissionsAction().
ui!ReportManager_0-1!13bc!10/04/2011-12:15:33:: e ERROR: HTTP status code --> 500
-------Details--------
Microsoft.ReportingServices.UI.FolderPage+InsufficientPermissionsToRoot: User '' does not have required permissions. Verify that sufficient permissions have been granted and Windows User Account Control (UAC) restrictions have been addressed.

   at Microsoft.ReportingServices.UI.FolderPage.Page_Init(Object sender, EventArgs e)

   at System.EventHandler.Invoke(Object sender, EventArgs e)

   at System.Web.UI.Control.OnInit(EventArgs e)

   at System.Web.UI.Page.OnInit(EventArgs e)

   at System.Web.UI.Control.InitRecursive(Control namingContainer)

   at Syste开发者_运维问答m.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
library!ReportServer_0-2!1ec4!10/04/2011-12:15:33:: Call to GetSystemPropertiesAction().
ui!ReportManager_0-1!13bc!10/04/2011-12:15:33:: e ERROR: System.Threading.ThreadAbortException: Thread was being aborted.
   at System.Threading.Thread.AbortInternal()
   at System.Threading.Thread.Abort(Object stateInfo)
   at System.Web.HttpResponse.End()
   at System.Web.HttpServerUtility.Transfer(String path, Boolean preserveForm)
   at Microsoft.ReportingServices.UI.ReportingPage.ShowErrorPage(String errMsg)

Looks like it is a permissions issue. I would look towards the user that is used for the service as well as hitting the database. Maybe you have it set to an anonymous connection?