I am facing a peculiar problem. Every so often template rendering fails 
because path to the template is not found.  If I refresh the browser a few 
times (i.e. reexecute the same code) , the page is displayed. The code 
fails at the highlighted line in the template.py of web.py. When I checked 
the reason I found path variable was getting set to None. Any idea what is 
going on?

    def _load_template(self, name):

        kind, path = self._lookup(name)

        

        if kind == 'dir':

            return Render(path, cache=self._cache is not None, 
base=self._base, **self._keywords)

        elif kind == 'file':

            return Template(open(path).read(), filename=path, 
**self._keywords)

        else:

            raise AttributeError, "No template named " + name            

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