naive bayes unclassified instances

helo all,

i have a problem with using a save model of naive bayes.
i use a train data set with 10-folds cross validation and naive bayes classifier. after this, i saved the model.
when i open a test set using the serializedclassifier with the saved model- not all the instances are classified, in addition i can't see the output probabilities because of this. what can be the reason that not all the instance are classified

haviv/