title: ValueError: bad marshal data in python scrapy
body: <p>I have already successfully installed scrapy in my computer(win7,32bit). when I ran my code,my program crashed with the error: </p>
  
  <pre><code>    Traceback (most recent call last):
      File "E:/python/wheather/whethercode.py", line 1, in &lt;module&gt;
      import scrapy
      File "F:\Program Files\python\lib\site-packages\scrapy-1.3.3-py2.7.egg\scrapy\__init__.py", line 34, in &lt;module&gt;
      from scrapy.spiders import Spider
      File "F:\Program Files\python\lib\site-packages\scrapy-1.3.3-py2.7.egg\scrapy\spiders\__init__.py", line 10, in &lt;module&gt;
      from scrapy.http import Request
      File "F:\Program Files\python\lib\site-packages\scrapy-1.3.3-py2.7.egg\scrapy\http\__init__.py", line 11, in &lt;module&gt;
      from scrapy.http.request.form import FormRequest
      File "F:\Program Files\python\lib\site-packages\scrapy-1.3.3-py2.7.egg\scrapy\http\request\form.py", line 9, in &lt;module&gt;
      import lxml.html
      ValueError: bad marshal data (unknown type code)
  </code></pre>
  
  <p>Hope you can help me. </p>