I have been getting the below error, have tried every solution online i could find. even found this below solution in this forum. Even in this didn't help. I'm in bad need to get a solution for this, please
Using the Telerik controls with RadScriptManager on your login page throws one of the following errors:
ASP.NET Ajax client-side framework failed to load
'Sys' is undefined
"Telerik.Web.UI" is undefined
As the website denies access to all pages to unauthorized users, access to the Telerik.Web.UI.WebResource.axd handler is unauthorized. This causes the handler to serve the content of the login page instead of the combined scripts, hence the error.
Add a <location> section to the application configuration file to allow access to Telerik.Web.UI.WebResource.axd to all users, like:
If a website was migrated from an older version of ASP.NET to the latest there might be a preCondition attribute added to the Telerik.Web.UI.WebResource.axd handler declaration stating that the runtime version is 2.0