hummingbird: AttributeError: 'XGBClassifier' object has no attribute 'raw_operator'

Code:

hummingmodel = hummingbird.ml.operator_converters.xgb.convert_sklearn_xgb_classifier(model, ‘pytorch’,extra_config={“n_features”:18})

Error:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
/var/folders/f2/9tbmpg411hndwc482xn850br0000gn/T/ipykernel_2889/1708670718.py in <module>
      1 # Use Hummingbird to convert the model to PyTorch
----> 2 hummingmodel = hummingbird.ml.operator_converters.xgb.convert_sklearn_xgb_classifier(model, 'pytorch',extra_config={"n_features":18})

~/opt/anaconda3/lib/python3.9/site-packages/hummingbird/ml/operator_converters/xgb.py in convert_sklearn_xgb_classifier(operator, device, extra_config)
    102              Please pass "n_features:N" as extra configuration to the converter or fill a bug report.'
    103         )
--> 104     tree_infos = operator.raw_operator.get_booster().get_dump()
    105     n_classes = operator.raw_operator.n_classes_
    106 

AttributeError: 'XGBClassifier' object has no attribute 'raw_operator'

XGB Version: 1.6.1 Hummingbird Version: 0.4.7

Any idea about this issue? What other configurations are required to make this work?