WEKA 3.8.4 : Supplied Test Set Issue

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can anyone tell me what am I doing wrong in WEKA tool? I am trying to supply a testing set with the same attributes as the training set but when looking at instances or sum of weighs there is a "?". What I could possibly be doing wrong?

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If it is an ARFF dataset, then Weka will load it incrementally for testing rather than fully into memory (which can be a problem for very large test sets). Since Weka doesn't know the full extent of the dataset, it can neither display the number of instances nor sum of instance weights.