Execption in ajax toolkit when loading page

Hi,

I have a simple solution with som ajax toolkit (Version 4.1.7.1005) and when i test and run in dev mode on localhost it is no problem. When i publish it on the webserver hotel it randomly doesnt load the page. The server hotel provide me this log. Anybody have an ide and can help me?

Exception information:
    Exception type: ArgumentNullException
    Exception message: Value cannot be null.
Parameter name: value
   at System.Boolean.Parse(String value)
   at AjaxControlToolkit.ToolkitScriptManagerCombiner.OutputCombinedScriptFile(HttpContextBase context)
   at AjaxControlToolkit.ToolkitScriptManager.OnInit(EventArgs e)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)