symfony2 twig render nesting sub directories

I seem to be having problems with twig render nesting To explain further I have the following view layout structure ``` resources .. config .. public .. etc .. views .. WeekBreakDown .. Export .. export.html.twig .. other.html.twig .. index.html.twig .. other.html.twig ``` Now I can render the following without error ``` $this->render('NameBundle:WeekBreakDown:index.html.twig'); ``` or ``` $this->render('NameBundle:WeekBreakDown:other.html.twig'); ``` What I am having trouble with is rendering the Export path. I have tried ``` $this->render('NameBundle:WeekBreakDown:Export:index.html.twig'); ``` and also.. ``` $this->render('NameBundle:WeekBreakDown:Export\index.html.twig'); ``` I get the `InvalidArgumentException: Unable to find template`