Django CMS "No module named html5lib"

I have a basic Django CMS site installed with all the default and recommended modules however I recieve and error saying...

Updated

Request Method: GET
Request URL:    http://teamdjango.lnukapps.co.uk/admin/cms/page/21/
Django Version: 1.3.1
Exception Type: ImportError
Exception Value:    
No module named html5lib
Exception Location: /usr/lib/python2.6/site-packages/django_cms-2.2-py2.6.egg/cms/utils/html.py in <module>, line 2
Python Executable:  /usr/bin/python
Python Version: 2.6.6
Python Path:    
['/usr/lib/python2.6/site-packages/setuptools-0.6c11-py2.6.egg',
 '/usr/lib/python2.6/site-packages/html5lib-0.90-py2.6.egg',
 '/usr/lib/python2.6/site-packages/django_classy_tags-0.3.4.1-py2.6.egg',
 '/usr/lib/python2.6/site-packages/django_mptt-0.4.2-py2.6.egg',
 '/usr/lib/python2.6/site-packages/django_sekizai-0.4.2-py2.6.egg',
 '/usr/lib/python2.6/site-packages/django_cms-2.2-py2.6.egg',
 '/usr/lib/python2.6/site-packages/django_filer-0.9a1-py2.6.egg',
 '/usr/lib/python2.6/site-packages/django_polymorphic-0.2-py2.6.egg',
 '/usr/lib/python2.6/site-packages/easy_thumbnails-1.0_alpha_18-py2.6.egg',
 '/usr/lib/python2.6/site-packages/cmsplugin_filer-0.8.0-py2.6.egg',
 '/usr/lib64/python26.zip',
 '/usr/lib64/python2.6',
 '/usr/lib64/python2.6/plat-linux2',
 '/usr/lib64/python2.6/lib-tk',
 '/usr/lib64/python2.6/lib-old',
 '/usr/lib64/python2.6/lib-dynload',
 '/usr/lib64/python2.6/site-packages',
 '/usr/lib64/python2.6/site-packages/PIL',
 '/usr/lib/python2.6/site-packages',
 '/usr/lib/python2.6/site-packages']

 Server time:   Fri, 14 Oct 2011 14:05:59 +0100

html5lib has been installed via easy_install html5lib and if I import html5lib in a default Python shell it imports fine.

Python 2.6.6 (r266:84292, May 20 2011, 16:42:11)
[GCC 4.4.5 20110214 (Red Hat 4.4.5-6)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import html5lib
>>>

This is set up on a clean install of Scientific Linux with Python 2.6.6.

I am using Django 1.3.1.

My INSTALLED_APPS is as shown.

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    # Uncomment the next line to enable the admin:
    'django.contrib.admin',
    # Uncomment the next line to enable admin documentation:
    'django.contrib.admindocs',
    'cms',
    'mptt',
    'menus',
    'south',
    'sekizai',
    'cms.plugins.flash',
    'cms.p开发者_开发知识库lugins.googlemap',
    'cms.plugins.link',
    'cms.plugins.snippet',
    'cms.plugins.text',
    'cms.plugins.twitter',
    'filer',
    'cmsplugin_filer_file',
    'cmsplugin_filer_folder',
    'cmsplugin_filer_image',
    'cmsplugin_filer_teaser',
    'cmsplugin_filer_video',
    # 'reversion',
)

My question (if it isn't obvious by now ;) ) is why is there a problem importing html5lib and how can I fix it.

Update 1

@matt-williamson Thanks, here is the html5lib file info

>>> html5lib.__file__
'/usr/lib/python2.6/site-packages/html5lib-0.90-py2.6.egg/html5lib/__init__.pyc'

I have updated the Django error to give more of the error page. As you can see the Python Path includes /usr/lib/python2.6/site-packages/html5lib-0.90-py2.6.egg which suggests to me it should be able to find it.

---

Either you have two versions of python installed or you need to set your python path.

Get the path the module is installed to

>>> import html5lib
>>> html5lib.__file__

'/Library/Python/2.7/site-packages/html5lib-0.90-py2.7.egg/html5lib/init.pyc'

^D

Set the PYTHONPATH environment variabled.

export PYTHONPATH="$PYTHONPATH:/Library/Python/2.7/site-packages/"
python manage.py runserver