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    • weka.core.UnassignedClassException: Class index is negative (not set)! at weka.core.Instances.numClasses(Instances.java:915) at weka.classifiers.evaluation.Evaluation.<init>(Evaluation.java:461) at weka.classifiers.evaluation.Evaluation.<init>(Evaluation.java:441) at weka.classifiers.Evaluation.<init>(Evaluation.java:211) at weka1.Weka1.classify(Weka1.java:84) at weka1.Weka1.main(Weka1.java:193)

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