this happens in 1.0b2 release: when you try to add an article and your site is not in the language specified:
Traceback (innermost last):
Module ZPublisher.Publish, line 60, in publish
Module ZPublisher.mapply, line 77, in mapply
Module ZPublisher.Publish, line 46, in call_object
Module plone.z3cform.layout, line 66, in __call__
Module plone.z3cform.layout, line 50, in update
Module collective.nitf.browser, line 36, in update
Module plone.dexterity.browser.add, line 112, in update
Module plone.z3cform.fieldsets.extensible, line 59, in update
Module plone.z3cform.patch, line 30, in GroupForm_update
Module z3c.form.group, line 137, in update
Module z3c.form.group, line 49, in update
Module z3c.form.group, line 45, in updateWidgets
Module z3c.form.field, line 277, in update
Module z3c.form.browser.select, line 51, in update
Module z3c.form.browser.widget, line 171, in update
Module z3c.form.widget, line 221, in update
Module z3c.form.widget, line 114, in update
Module zope.schema._bootstrapfields, line 78, in __get__
Module zope.schema._bootstrapfields, line 182, in validate
Module zope.schema._field, line 389, in _validate
ConstraintNotSatisfied: pt-br
this happens in 1.0b2 release: when you try to add an article and your site is not in the language specified:
see: https://github.com/collective/collective.nitf/blob/1.0b2/src/collective/nitf/browser.py#L36