ArrayIndexOutOfBoundException in mahout SGD

[Chandra Mohan, Ananda Vel Murugan]

Hi,

I am running Mahout SGD. I read News group sample code and I have created my 
own code as my requirements are slightly different.

I am getting ArrayIndexOutOfBound Exception while running 
AdaptiveLogisticRegression.train(actual,vector) function. I looked into the 
stack trace and found the exact place where I am getting the exception. There 
is a class called "DefaultGradient" in "org.apache.mahout.classifier.sgd" 
package and exception occurs inside apply function,

This is the code for apply function.

Vector v = classifier.classify(instance);

    Vector r = v.like();
    if (actual != 0) {
      r.setQuick(actual - 1, 1);
    }
    r.assign(v, Functions.MINUS);
    return r;

I am getting the exception in r.setQuick(actual - 1, 1). Can someone help me in 
resolving this exception? Thanks in advance.

Regards,
Anand.C