                     WMFAlertManager.sharedInstance.showErrorAlert(error, sticky: false, dismissPreviousAlerts: false)
                 }
             }
-        } else if error.isUnexpectedResponseError {
+        } else if error.isUnexpectedResponseError || error.isInvalidParameterError {
             
             showExternal(url: url, source: source)
             

    
    private func processFailure(error: NSError, source: ProcessSource, url: URL) {
        
        if error.domain == NSURLErrorDomain &&
            error.code == NSURLErrorCancelled { //error came via cancelled fetch, no need to propogate to user
            return
        }
        

    
    var isUnexpectedResponseError: Bool {
        return domain == Fetcher.unexpectedResponseError.domain && code == Fetcher.unexpectedResponseError.code
    }
    
    var isCancelledError: Bool {
        return domain == NSURLErrorDomain &&
        code == NSURLErrorCancelled
    }
    
    var isInvalidParameterError: Bool {
        return self == Fetcher.invalidParametersError
    }
}

