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Filter data in the "Excel" table via a drop-down error

Hi Guys,
I have a qq. I have an API datasource that I use to populate the excel table plugin. All fine.

I have created a drop-down that shows items from one of the fields in the data source. All fine.

When I try and “Filter the datasource” by saying it must contain a value from the dropdown I get the following error.


Any ideas, I am sure it is something REALLY simple.