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java.lang.IllegalArgumentException: statsmodels.datasets.anes96.data	at sklearn.preprocessing.FunctionTransformer.parseUFunc(FunctionTransformer.java:102)	at sklearn.preprocessing.FunctionTransformer.encodeFeatures(FunctionTransformer.java:57)	at sklearn_pandas.DataFrameMapper.encodeFeatures(DataFrameMapper.java:70)	at org.jpmml.sklearn.Main.run(Main.java:146)	at org.jpmml.sklearn.Main.main(Main.java:107)