R snippet 2:1 console? R snippet 2:1 doesn't work properly

Simple 2 line code get the names from a data frame and assign them as column names in the other

error Execute failed: Name of DataColumnSpec must not be null!

where is the console of this node?

That sounds like one of the community scripting nodes, and may be best asked in the corresponding forums: https://www.knime.com/forum/scripting-integrations