Can't Save Ruleset using Store Operator

Hi Everyone, just a quick bug I found.

If you try to save a rule set generated by "Subgroup Discovery"-->"Store"

You get the following error:

Message: Cannot store data at 'path/name' java.io.NotSerializableException: com.rapidminer.operator.learner.subgroups.hypothesis.Rule

The same thing happens when you right click on the rule set output port and try to save to the repository directly.

-Gagi  :P