Cannot configure in K-NN node

KNIME Analytics Platform
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//update: OK. Got it... I missed to define class names as strings in a column. So I changed the "Owner, Non-Owner" column and... it works. :roll:

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I'm trying to work with Knime on the Data Mining Lectures of MIT OCW. Tried to build a model with k-Nearest Neighbor Algorithm block on this (very small) dataset

I partitioned the data in 2 parts: 18 rows for training and 6 rows as test set. But when I am trying to configure the K-NN block, I got this:

Does anyone have a clue, what I am doing wrong? :cry:

Thanks a lot,
Benjamin

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Thanks for answering you own question, Benjamin! :-)

...but it does tell us that we should be a bit more specific in our error
messages...