Dislocation vector, affine to current

hello

As a part of a script, I am using the CalculateDisplacementsModifier function. Because I have strain in the sample, I need the affine mapping option.

If I try
node =import_file(“/home/XXX”+getfilen[i], multiple_frames = True)
dmod = CalculateDisplacementsModifier(affine_mapping =
ReferenceConfigurationModifier.AffineMapping.ToCurrent)
dmod.reference.load(“/home/XXX.”+getfilenref[i])
node.modifiers.append(dmod)

I get
NameError: name ‘ReferenceConfigurationModifier’ is not defined

maybe it is because I cant import
from ovito.pipeline import *

Because when i try i get

ImportError: No module named ‘ovito.pipeline’