PyCharm 1.5: No module named MySQLdb

hello all,

i got this error when running my project, having these lines in the console:

/Users/me/python/virtualenv/bmfvca6/bin/python manage.py runserver 8000
Traceback (most recent call last):
  File "manage.py", line 14, in <module>
    execute_manager(settings)
  File "/Users/me/python/virtualenv/bmfvca6/lib/python2.6/site-packages/django/core/management/__init__.py", line 438, in execute_manager
    utility.execute()
...

  File "/Users/me/python/virtualenv/bmfvca6/lib/python2.6/site-packages/django/db/backends/mysql/base.py", line 14, in <module>
    raise ImproperlyConfigured("Error loading MySQLdb module: %s" % e)
django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdb

Process finished with exit code 1

but executing the same command in the terminal (i'm on macosx) works:

$/Users/me/python/virtualenv/bmfvca6/bin/python manage.py runserver 8000
Validating models...

0 errors found
Django version 1.3, using settings 'momo.settings'
Development server is running at http://127.0.0.1:8000/
Quit the server with CONTROL-C.

why pycharm is ignoring my module?

thanks in advance for help,

gerard