Laravel 5 - Output valid XML

I'm using this http://ift.tt/1JawdLr to output XML, but it's not actually valid XML output.

$xml = DB::table("news")->select(['id', 'title', 'content', 'date_posted', 'author'])->orderBy("date_posted", "asc")->get();
        $formatter = Formatter::make($xml, Formatter::XML);
        $output   = $formatter->toXml();

        return response($output, 200)
            ->header('Content-Type', 'text/xml');

So how can I output valid XML in Laravel 5?

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