The thing about the below error is that I have working controls on the page I'm using, it's just this one control that's missing. Why is that? Is my version too old and this isn't available in that version? The Telerik.Web.UI version is 2014.1.416.35, and yes, I know it's old, but it's what I've got.
Parser ErrorDescription: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.
Parser Error Message: Unknown server tag 'telerik:RadDateRangePicker'.