Template library not found

Hi,

I have a custom templatetag inside an app, and also the app is in settings.INSTALLED_APPS. Also, I got an error:

"'contacto_formulario' is not a valid tag library: Template library contacto_formulario not found, tried ... "

The funny thing is that the templatetag works correctly in the development environment with "manage.py runserver", but not works deployed production environment.
This happens after a migration from Django 1.3 to 1.4

I don't know where to look for the error... Any idea? could i missing some setting?

thanks,

Mario.

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