Hello Scott Smith,
Please accept our apologies for the delayed response.
The page of that type (External Page
) needs to have an url, and the quickest way to fix it is to enter a valid url in ExternalUrl
Notice that when you create a page inside Sitefinity administration, the Url field is required for External pages. So you can get an empty Url value if you're trying to insert pages by code.
Don't hesitate to contact us if you have other questions.
the Telerik team
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