Revit 2019 - Failed to load language 'IronPython 2.7.3': Method not found:

I have not used Revit 2019 in a while and although it is not supported I need to develop a script.

Upgrading the project to a later version is not an option.

There is an issue with the Python Script node.

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Any idea how to fix it?

re-installing dynamo 2.0.4 has solved the issue.