Hi,
do you have Neo4j installed on your local machine? If not you need to do so if you want to work with it. The nodes only provide a connection to the graph database but do not come with it build in.
If you want to play around with networks and do not want to install Neo4j you can also have a look at the KNIME Network Mining extension. This includes everything you need to work with networks. To get started have a look at these examples.
Bye
Tobias
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