Commented Unassigned: Toolscriptmanager is not a known element [27615]

I am using ajax control toolkit in VS 2005. The auto suggest box worked fine when I was working on it but hear recently I have been receiving these errors. "Toolscriptmanager is not a known element", "Autocomplete extender is not a known element", and "Unable to auto refresh ajaxcontroltoolkit.dll". Do you know what I can do to get rid of these errors? I have uninstalled and reinstalled ajax control toolkit several times and the errors will go away for a little while and then come back.
Comments: Thank you for sharing your experience! The current version of AJAX Control Toolkit does not include the old ToolkitScriptManager. We replaced it with the standard ScriptManager, because it produced a lot of errors and problems. Try upgrading to the newest version of AJAX Control Toolkit (version 15.1.2).