Mod_python error: "PythonHandler app::handler"

Traceback (most recent call last):

  File "/usr/lib64/python2.4/site-packages/mod_python/apache.py", line 287, in HandlerDispatch
    log=debug)

  File "/usr/lib64/python2.4/site-packages/mod_python/apache.py", line 464, in import_module
    module = imp.load_module(mname, f, p, d)

  File "/var/www/sclqld/htdocs/lu/app.py", line 720, in ?
    app = App()

  File "/var/www/sclqld/htdocs/lu/app.py", line 56, in __init__
    self.edition_template = loader.load('edition.xml')

  File "/usr/lib64/python2.4/site-packages/genshi/template/loader.py", line 227, in load
    filename, encoding=encoding)

  File "/usr/lib64/python2.4/site-packages/genshi/template/loader.py", line 265, in _instantiate
    allow_exec=self.allow_exec)

  File "/usr/lib64/python2.4/site-packages/genshi/template/base.py", line 377, in __init__
    self.stream = list(self._prepare(self._parse(source, encoding)))

  File "/usr/lib64/python2.4/site-packages/genshi/template/base.py", line 430, in _prepare
    yield kind, (directives, list(substream)), pos

  File "/usr/lib64/python2.4/site-packages/genshi/template/base.py", line 444, in _prepare
    cls=cls or self.__class__)

  File "/usr/lib64/python2.4/site-packages/genshi/template/loader.py", line 237, in load
    raise TemplateNotFound(filename, search_path)

TemplateNotFound: Template "_masthead.html" not found