Thread local storage issue under Apache

Hi everyone.

I have a django project in where I've added a custom .py file which 
launches a shell command (a GDAL utility to manipulate shapefiles):
subprocess.call(["ogr2ogr", "-t_srs", "EPSG:900913", shpGoogle, shpOrig])

If I run the function containing this command using django web server 
everything works fine and my new file have produced and stored on the 
filesystem.

But if I run the same application under the Apache web server, I get the 
following error:
Fatal Python error: Couldn't create autoTLSkey mapping

Do you have any idea on how to solve this?

Thanks in advance

Configuration details follows...

I'm using Apache/2.2.20 on Ubuntu-11.10 mod_wsgi-3.3 Python-2.7.2 
django-1.3.1

My django.wsgi file is the following
import os, sys
sys.path.append('/home/candini/Repos/CanetaRepo/tmp/STO')
os.environ['DJANGO_SETTINGS_MODULE'] = 'settings'
import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()