cakePHP File Download was not found or not readable

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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