以下代码在库中
self.env = Environment(loader=PackageLoader('netjsonconfig.backends.openwrt', 'templates'),
trim_blocks=True)
该库由消费者应用程序使用，如果通过python setup.py develop消费者应用程序安装的库正常工作，而如果通过pip消费者应用程序安装的库崩溃并出现以下回溯（请参阅在 travis 上构建失败）：
Traceback (most recent call last):
File "/home/travis/build/openwisp/django-netjsonconfig/django_netjsonconfig/tests/test_device_admin.py", line 33, in test_download_config
response = self.client.get(path)
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/django/test/client.py", line 503, in get
**extra)
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/django/test/client.py", line 304, in get
return self.generic('GET', path, secure=secure, **r)
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/django/test/client.py", line 380, in generic
return self.request(**r)
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/django/test/client.py", line 467, in request
six.reraise(*exc_info)
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/django/utils/six.py", line 686, in reraise
raise value
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/django/core/handlers/base.py", line 149, in get_response
response = self.process_exception_by_middleware(e, request)
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/django/core/handlers/base.py", line 147, in get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/django/utils/decorators.py", line 149, in _wrapped_view
response = view_func(request, *args, **kwargs)
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/django/views/decorators/cache.py", line 57, in _wrapped_view_func
response = view_func(request, *args, **kwargs)
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/django/contrib/admin/sites.py", line 244, in inner
return view(request, *args, **kwargs)
File "/home/travis/build/openwisp/django-netjsonconfig/django_netjsonconfig/admin.py", line 52, in download_view
device.backend_instance.generate(device.name)
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/netjsonconfig-0.3.1-py3.4.egg/netjsonconfig/backends/openwrt/openwrt.py", line 104, in generate
uci = self.render()
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/netjsonconfig-0.3.1-py3.4.egg/netjsonconfig/backends/openwrt/openwrt.py", line 77, in render
additional_output = renderer.render()
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/netjsonconfig-0.3.1-py3.4.egg/netjsonconfig/backends/base.py", line 41, in render
template = self.env.get_template(template_name)
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/Jinja2-2.8-py3.4.egg/jinja2/environment.py", line 812, in get_template
return self._load_template(name, self.make_globals(globals))
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/Jinja2-2.8-py3.4.egg/jinja2/environment.py", line 774, in _load_template
cache_key = self.loader.get_source(self, name)[1]
File "/home/travis/virtualenv/python3.4.2/lib/python3.4/site-packages/Jinja2-2.8-py3.4.egg/jinja2/loaders.py", line 235, in get_source
raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: system.uci
似乎它正在寻找模板，./templates但显然不起作用。我想我对 Jinja 的理解TemplateLoaders不是很好。我究竟做错了什么？