Fatal error: Cannot pass parameter 1 by reference

class output {
  var $config = array();
  var $html = null;
  var $action = '';
  var $words = array();
  var $templates = array();
  function __construct($config,$action) {
    $this->config = &$config;
    $this->action = $action;
    $this->words = stringClass::loadwords('global');
    $this->loadTemplate('global',$this->words);
  }

$_tmp = 'global'
$this->loadTemplate($_tmp, $this->words);