java.lang.ArithmeticException: / by zero

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java.lang.ArithmeticException: / by zero
at ml.dmlc.xgboost4j.java.Booster.predict(Booster.java:230)
at ml.dmlc.xgboost4j.java.Booster.predict(Booster.java:285)
at ml.dmlc.xgboost4j.scala.Booster.predict(Booster.scala:126)
at ml.dmlc.xgboost4j.scala.example.spark.SparkWithRDD1$.main(SparkWithRDD1.scala:61)
at ml.dmlc.xgboost4j.scala.example.spark.SparkWithRDD1.main(SparkWithRDD1.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)

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