Basically, there are two possible reasons to receive "Telerik is undefined' error with our Prometheus controls:
- If you are using RadScriptManager and you might get the error in case the http handler is probably not registered in your web.config. Please check for the presence of:
| <add path="Telerik.Web.UI.WebResource.axd" verb="*" type="Telerik.Web.UI.WebResource, Telerik.Web.UI" validate="false" />
Additionally, can you please double-check that your web.config file is properly configured to work for ASP.NET AJAX web site?
the Telerik team