在方法Kohana php 2.3.4中调用方法

class Search_Core
{    
    public function result($term)
        {
            $this->search->title = "Search Results";
            $this->search->content = View::factory("search_view");

            $test = $this->pleaseWork("This should be on the screen");
            $this->search->content->test = $test;

            return $this->search;
        }

    public function pleaseWork($word)
        {
            $dude = $word;

            return $dude;
        }

}

我以前在同一个类的方法中调用过方法,但是由于某些原因这不起作用。我可以用如下内容替换$test变量:

$test = "a bunch of random words";

错误位于Kohana.php行#841。