Commented Issue: Report Viewer Error - Parameter name: panelsCreated[1] [26778]

I try to use a Reportviewer 10.0.0.0 in a project that uses AJAX controllers version 4.1.40412.2 If I first add a ScriptManager and a reportviewer there is no problem, the Reportviewer is shown. If I then add another AjaxToolboxScript the page starts with depugger error:

"Error: Sys.ArgumentNullException: Value cannot be null.Parameter name: panelsCreated[1]"

Comments: Has anyone found the resolution for this issue please, I am facing the same issue