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Argument {0} is Null or Empty in Azure Data Factory

Richard Swinbank diagnoses a problem:

I encountered this error recently while using Azure Data Factory’s (ADF) new(ish) Script activity to run a SQL query. It took me a while to find a fix, and when it happened again two weeks later I’d completely forgotten it. With a bit of luck, writing it down will help me remember next time – and if it helps you too, great

Read on to see what the problem was and how Richard solved it.