OSM Tracks and Routes

This workflows demonstrates the visualisation of gps-tracks and -routes on top of the Open Street Map (www.openstreetmap.org).

This is a companion discussion topic for the original entry at https://kni.me/w/F_Y9dckZQrFCdChU

I am trying to rebuild this KNIME example workflow with my own data. Where I am getting stuck is with the GroupBy part. Whenever I try to connect and configure a Color Manager node to it, it shows me an error:

The dialog cannot be opened for the following reason: Please provide input table with at least one column with either nominal and/or lower and upper bounds defined.

Well, even the example does not provide one such input table, only a table with a string and list. What am I doing wrong?