def validate ( self, object, name, value ):
        raise TraitError, (
              "The '%s' trait of %s instance has an unknown type. "
              "Contact the developer to correct the problem." % (
              name, class_of( object ) ) )

#-------------------------------------------------------------------------------
#  'TraitRange' class:
#-------------------------------------------------------------------------------
tests the security group creation and deletion functionalities:
dataset/ETHPy150Open enthought/traits/traits/trait_handlers.py/TraitHandler.validate--crossover with--dataset/ETHPy150Open openstack/horizon/openstack_dashboard/test/integration_tests/tests/test_security_groups.py/TestSecuritygroup.test_securitygroup_create_delete