Also, if I run the following:

import yaml
yaml.dump(node_function(INPUT).to_dict(), open("charles.yml", "w"))

No error happens

This one is a bit weird - it's not really a Kedro issue, what are you trying to achieve here?

I wanted to have a node output YML instead of CSV

Okay you can use

yaml.YAMLDataSet

in your data catalog, you don't need to use the yaml library yourself

My point when showing this was that

The YAML data set would throw an error

When I tried to return a dictionary from a node

oh sorry I got mixed up with the messages

yet it would NOT when i ran it locally

no worries

all good

👍