我已经在一个新的Ubuntu 12.04LTS Vagrant机器上设置了Diazo，使用了以下步骤：

1. apt-get update
2. apt-get install python-setuptools
3. apt-get install build-essential python2.7-dev libxslt1-dev
4. easy_install -U diazo
   1.已按照Diazo Quickstart中的说明操作（添加最新的bootstrap.py）
   快速入门中的Diazo示例运行良好（在[filter:theme]中添加了少量read_network = true）。
   但是，当我添加现有项目（在其他计算机上工作）时，在尝试查看站点时，bin/paster serve出现以下错误

Exception happened during processing of request from ('192.168.33.1', 50171)
Traceback (most recent call last):
  File "/home/vagrant/test/eggs/Paste-1.7.5.1-py2.7.egg/paste/httpserver.py", line 1068, in process_request_in_thread
    self.finish_request(request, client_address)
  File "/usr/lib/python2.7/SocketServer.py", line 323, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/lib/python2.7/SocketServer.py", line 638, in __init__
    self.handle()
  File "/home/vagrant/test/eggs/Paste-1.7.5.1-py2.7.egg/paste/httpserver.py", line 442, in handle
    BaseHTTPRequestHandler.handle(self)
  File "/usr/lib/python2.7/BaseHTTPServer.py", line 340, in handle
    self.handle_one_request()
  File "/home/vagrant/test/eggs/Paste-1.7.5.1-py2.7.egg/paste/httpserver.py", line 437, in handle_one_request
    self.wsgi_execute()
  File "/home/vagrant/test/eggs/Paste-1.7.5.1-py2.7.egg/paste/httpserver.py", line 287, in wsgi_execute
    self.wsgi_start_response)
  File "/home/vagrant/test/eggs/Paste-1.7.5.1-py2.7.egg/paste/urlmap.py", line 203, in __call__
    return app(environ, start_response)
  File "/home/vagrant/test/eggs/diazo-1.0b1-py2.7.egg/diazo/wsgi.py", line 353, in __call__
    transform_middleware = self.get_transform_middleware()
  File "/home/vagrant/test/eggs/diazo-1.0b1-py2.7.egg/diazo/wsgi.py", line 342, in get_transform_middleware
    tree=self.compile_theme(),
  File "/home/vagrant/test/eggs/diazo-1.0b1-py2.7.egg/diazo/wsgi.py", line 337, in compile_theme
    xsl_params=xsl_params,
  File "/home/vagrant/test/eggs/diazo-1.0b1-py2.7.egg/diazo/compiler.py", line 106, in compile_theme
    read_network=read_network,
  File "/home/vagrant/test/eggs/diazo-1.0b1-py2.7.egg/diazo/rules.py", line 164, in process_rules
    rules_doc = annotate_rules(rules_doc)
  File "/home/vagrant/test/eggs/diazo-1.0b1-py2.7.egg/diazo/utils.py", line 49, in __call__
    result = self.xslt(*args, **kw)
  File "xslt.pxi", line 556, in lxml.etree.XSLT.__call__ (src/lxml/lxml.etree.c:110044)
XSLTApplyError: 
            ERROR: Unknown includemode or @method attribute

我尝试过设置deployment docs中建议的不同includemodes，但没有成功。
除了我的扩展规则之外，我的项目和演示之间（目前）唯一的区别是我包含了xmlns:xi="http://www.w3.org/2001/XInclude"
导致错误的原因是什么？如何修复？