The type initializer for 'weka.core.WekaPackageManager' threw an exception - weka c#

I am using weka api through c#. I have converted weka jar file to c# dll by using ikvm. Then I have added the converted dll (wekacsharp.dll) in my reference.

I have also added ikvm.gnu.classpath.dll, IKVM.OpenJDK.Core.dll, IKVM.OpenJDK.Util.dll, IKVM.OpenJDK.Text.dll, IKVM.OpenJDK.Core in my reference.

I am trying to use j48 algorithm but i am getting the error. Screen shot of code error is attached. Kindly check it and suggest me something to fix it.

Code:

    public static void classifyTest()
    {
        try
        {
            weka.core.Instances insts = new weka.core.Instances(new java.io.FileReader("iris.arff"));
            insts.setClassIndex(insts.numAttributes() - 1);

            weka.classifiers.Classifier cl = new weka.classifiers.trees.J48();
            //Console.WriteLine("Performing " + percentSplit + "% split evaluation.");

            //randomize the order of the instances in the dataset.
           // weka.filters.Filter myRandom = new weka.filters.unsupervised.instance.Randomize();
           // myRandom.setInputFormat(insts);
           // insts = weka.filters.Filter.useFilter(insts, myRandom);

            int trainSize = insts.numInstances() *  percentSplit / 100;
            int testSize = insts.numInstances() - trainSize;
            weka.core.Instances train = new weka.core.Instances(insts, 0, trainSize);

            cl.buildClassifier(train);
            int numCorrect = 0;
            for (int i = trainSize; i < insts.numInstances(); i++)
            {
                weka.core.Instance currentInst = insts.instance(i);
                double predictedClass = cl.classifyInstance(currentInst);
                if (predictedClass == insts.instance(i).classValue())
                    numCorrect++;
            }
            //java.io.Console.WriteLine(numCorrect + " out of " + testSize + " correct (" +(double)((double)numCorrect / (double)testSize * 100.0) + "%)");
        }
        catch (java.lang.Exception ex)
        {
            ex.printStackTrace();
        }
    }