Hello Adam,
sorry I missed that. That is a bit of a surprising combination for me 
How did you manage to use the KNIME Workflow Executor for Spark within the Local Big Data Environment and why would you do that? I would be also interested to know why you are using the extension and if there could be an alternative. The reason is that we most likely will no longer maintain the extension because not many people are using it and it is a lot of effort to maintain it.
Bye
Tobias