ArrayIndexOutOfBoundsException when classifying an instance

Hi everyone.

I am trying to classify instances and code is given below.

public void prepare_data() throws IOException {
		BufferedReader buf_reader=new BufferedReader(new
FileReader(this.train_file));

		Instances train_data = new Instances(buf_reader);
		train_data.setClassIndex(train_data.numAttributes() - 1);
		this.train=train_data;
		buf_reader.close();
		
		buf_reader=new BufferedReader(new FileReader(this.test_file));

		Instances test_data = new Instances(buf_reader);
		test_data.setClassIndex(test_data.numAttributes() - 1);
		this.test=test_data;
		buf_reader.close();
	}

public void filteredFier() throws Exception {
		
		System.out.println("hi"+ this.train.equalHeaders(this.test));
		NumericToNominal nn = new NumericToNominal();
		String[] options= {"-R", "first-last"};
		nn.setOptions(options);
		nn.setInputFormat(this.train);
		this.rf=new RandomForest();
		this.fc = new FilteredClassifier();
		this.fc.setFilter(nn);

		this.fc.setClassifier(this.rf);
	
		this.fc.buildClassifier(this.train);

		Evaluation eval=new Evaluation(this.train);

			
		eval.crossValidateModel(this.fc,this.train,10,new Random(1));
			
		System.out.println(eval.toSummaryString());

		


	}
	public void get_accuracy() throws Exception {
		


		for (int i = 0; i < this.test.numInstances(); i++) {
			double clsLabel = this.fc.classifyInstance(this.test.instance(i));
			System.out.println(clsLabel);
		}


		
		
	}

I get ArrayIndexOutOfBoundException. Somebody here knows solution, I need
your help. Thank you in advance.




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