If you’re getting that error it’s b/c it can’t open the file. the CURL request is failing for some reason. Is there a redirect happening or something else that could block access to the file? This likely isn’t an issue with DataGrab itself… when this error happens its almost always a configuration error or something blocking access to the file.

In the datatypes/dt.datagrab_xml.php file is the following function around line 248…. try adding the if (!$data) conditional to it and see if it adds any helpful error message in the log file.

private function _curl_fetch($url)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_FRESH_CONNECT, 1);

        $data = curl_exec($ch);

        curl_close($ch);

        if (!$data) {
            $this->addError('cURL Error: ' . curl_error($ch));
        }

        return $data;
    }