Django lxml encode error

Python script using lxml library that work fine on console suddenly throwing out error when importing it from django views module.

File "lxml.etree.pyx", line 123, in init lxml.etree (src/lxml/lxml.etree.c:160385) TypeError: encode() argument 1 must be string without null bytes, not unicode"

It unlikely problem with the encoding of the content I want to parse because it just importing the module and I'm not calling any function that do the parsing yet. Almost giving up in my search until I found this answer[1] on Stackoverflow. It turn out on console I'm using Python 2.6 while mod_wsgi, which run the django app is compiled against python 2.7.
[1]:http://stackoverflow.com/questions/9465248/runtimewarning-compiletime-version-2-6-of-module-lxml-etree-does-not-match-ru