out of bounds exception

Hi. I am running the attached code. I am getting

C:\Users\Bill\Desktop\Diamond>java -cp ./lib/xmlParserAPIs-2.2.1.jar;./lib/gdata-fi
nance-2.0.jar;./lib/gdata-core-1.0.jar;./lib/mail.jar;./lib/mysql-connector-java-5.
1.18-bin.jar;./lib/weka.jar;./lib/google-collect-1.0-rc1.jar;./bin CSVSimple
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
        at weka.classifiers.Evaluation.updateMargins(Evaluation.java:3591)
        at weka.classifiers.Evaluation.updateStatsForClassifier(Evaluation.java:341
8)
        at weka.classifiers.Evaluation.evaluationForSingleInstance(Evaluation.java:
1505)
        at weka.classifiers.Evaluation.evaluationForSingleInstance(Evaluation.java:
1560)
        at weka.classifiers.Evaluation.evaluateModelOnceAndRecordPrediction(Evaluat
ion.java:1597)
        at weka.classifiers.Evaluation.evaluateModel(Evaluation.java:1477)
        at CSVSimple.main(CSVSimple.java:62)




when executing:
C:\Users\Bill\Desktop\Diamond>java -cp ./lib/xmlParserAPIs-2.2.1.jar;./lib/gd
nance-2.0.jar;./lib/gdata-core-1.0.jar;./lib/mail.jar;./lib/mysql-connector-j
1.18-bin.jar;./lib/weka.jar;./lib/google-collect-1.0-rc1.jar;./bin CSVSimple


I am trying to run the example at http://weka.wikispaces.com/Use+WEKA+in+your+Java+code

which has this:
Train/test set
In case you have a dedicated test set, you can train the classifier and then evaluate it on this test set. In the following example, a J48 is instantiated, trained and then evaluated. Some statistics are printed to stdout:
 import weka.core.Instances;
 import weka.classifiers.Evaluation;
 import weka.classifiers.trees.J48;
 ...
 Instances train = ...   // from somewhere
 Instances test = ...    // from somewhere
 // train classifier
 Classifier cls = new J48();
 cls.buildClassifier(train);
 // evaluate classifier and print some statistics
 Evaluation eval = new Evaluation(train);
 eval.evaluateModel(cls, test);
 System.out.println(eval.toSummaryString("\nResults\n======\n", false));

Does anyone have any insight there?
thanks.
CSVSimple.java