MISMO Classifier: cannot evaluate Model

Hi all,

I've been using the MISMO classifier with multi instance data and while 
I can create the classifier (after putting "test=false" in 
$HOME/wekafiles/props/Capabilities.props), I am getting the following 
error message, when I evaluate the created model:

java.lang.IllegalStateException: All class values in a bag must be the 
same! New value: ?
	at 
weka.filters.unsupervised.attribute.PropositionalToMultiInstance.batchFinished(PropositionalToMultiInstance.java:575)
	at weka.filters.Filter.useFilter(Filter.java:708)
	at weka.classifiers.mi.MISMO.distributionForInstance(MISMO.java:1375)
	at 
weka.classifiers.evaluation.Evaluation.evaluationForSingleInstance(Evaluation.java:2208)
	at 
weka.classifiers.evaluation.Evaluation.evaluateModelOnceAndRecordPrediction(Evaluation.java:2246)
	at 
weka.classifiers.evaluation.Evaluation.evaluateModel(Evaluation.java:2122)
	at weka.classifiers.Evaluation.evaluateModel(Evaluation.java:689)

I have checked my data and created a minimal example of it, but it 
appears that the class value is correct: in my case it's either true or 
false and appears at the end of each ARFF file line. I don't really 
understand what the error message even means. A bag consists of:

bagId,'value1,value2\nvalue3,value4',true

So how could there be different class values in a bag? It's always the 
third argument on the line and can only appear once.

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