Unable to receive a ScriptNotify event from: ' '. The website attempted to send a ScriptNotify event to the app from a WebView ...

Unable to receive a ScriptNotify event from: '<0s>'. The website attempted to send a ScriptNotify event to the app from a WebView URI that is not included in the ApplicationContentUriRules for this app. To permit this event, add the URI to the ApplicationContentUriRules section of the package manifest. (In Visual Studio, add this URI to the Content URIs tab of the Manifest Designer.)