NotSerializableException saving CRF models (Information Extraction plugin)

fnl

After a couple of hours of fiddling around, I got the IE plugin to work (see other threads with problems about the Text Visualizer).

Now I am trying to save the CRF models, but I get a NotSerializableException from the Store operator.
Particularly, the data from
com.rapidminer.operator.learner.sequence.crf.tools.FeatureDictionary
seems to be non-serializable.

Is this is a problem because I am new and am plugging the model output from the validator directly into a store operator, or is this direct storing of models principally OK?
If it is fine, does anybody know/can confirm that storing CRF models from the IE plugin does not work or can tell me how to do it?
Maybe some data transformation is required?