MISMO Does not implement WeightedInstancesHandler Interface

Hello,

I am attempting to build a MISMO classifier from an .arff formatted dataset of multiple-instance data which do not include any instance weights. I ultimately want to access this classifier through the python-weka-wrapper3 python module, but have been encountering a Java Exception stating MISMO does not implement the WeightedInstancesHandler interface. Aside from being inconsistent with the documentation (https://weka.sourceforge.io/doc.stable/weka/classifiers/mi/MISMO.html) and what I saw when actually looking at the MISMO.java class, I would not have expected any issues related to weights given no weights are specified for any instances in the dataset.

I've attempted to build the classifier through the pwk3 wrapper, the Java API, and the Weka GUI in Weka versions 3.8.6, 3.9.5, and 3.9.6 but have consistently gotten this error.

I ~believe~ this exact dataset has been used to create a MISMO classifier in older versions of Weka (circa 2014), though I'm not sure which version that was in.

Any insight into how to further debug this issue would be greatly appreciated.

Thank you,
Sean Ryan
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