[KED-2628] Confusing error message if number of node inputs/outputs dont match defintion in node.py

[lucasjamar]

Description

I am using kedro 0.17.3 and I noticed that having more or fewer inputs or outputs in a node than what is defined in pipeline.py throws this rather confusing error message.
(I am using conda 4.9.2, python 3.8 and windows 10)

In kedro<=0.16.6, the error message was clearer and one could easily pinpoint what needed to change:

Context

This issue could be related to similar issues users have been having with this error message:

1. https://stackoverflow.com/questions/66751310/kedro-failed-to-find-the-pipeline-named-default/67400956#67400956
2. Default and Custom Pipeline not being registered and cannot be found. #731 (comment)
3. https://discourse.kedro.community/t/failed-to-find-the-pipeline-named-default/438

Steps to Reproduce

1. pip install kedro>=0.17.0
2. kedro new --starter=pandas-iris
3. Remove or duplicate one of the inputs/ ouputs in one of the pipeline.py files.

[antonymilne]

Thanks for the bug report! This does indeed look like the same issue that we were having before and thought we had fixed in 0.17.3 😕

@lorenabalan I think you pointed out before that there was still a bug to do with this. Is it the same as the one reported? Do we already have a ticket for it?

[lorenabalan]

No, that was related to upgrading kedro version in place vs moving code to new environment with latest kedro version installed. This should be filed under a new ticket.

[antonymilne]

@lucasjamar Trying this out myself, I think the node validation error message is actually still being shown, just it's further up the stack trace. This is indeed confusing though, so I've filed a ticket to try and fix it and make the clearer error message appear last.

[lucasjamar]

Very much appreciated @AntonyMilneQB :)

[antonymilne]

This is solved in 9e87ffb, so will be part of 0.17.4. Thanks for the bug report!