cakePHP File Download was not found or not readable

[george dan gil Duran]

I've been struggling now for an hour trying to fix this. I used this to 
download file from app/uploads/directory. It says the directory not found 
or not readable. Yet i checked it and it was there also the file using 
$file['File']['filename']. I want to know what I am missing here.?

$file = $this->File->findById($id);

        $extension = pathinfo($file['File']['filename'],PATHINFO_EXTENSION);

        $this->response->file('uploads'.DS, array('download' => true,
            'id' => $file['File']['filename'],
            'name' => $file['File']['filename']
            )
        );
        $this->response->type($extension);
        return $this->response;

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