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I have created lightning dual-listbox component to replace mulit-select picklist field to enter data using screen flows. The component successfully display the existing values on the multi-picklist field. Now I want to update back to the database after the user changing the values in dual-listbox. I Loop and assinment element to the update. But it doesn't work and throwing an error

The Lightning Component c:EthnicityDualMultiboxComponent generated invalid output for field values. Contact your administrator with these details: Flow encountered an error when processing and converting between data types. Please check the flow and ensure all data types are matched correctly.

I don't know how to get the selected list as a collection on the flow assignment element.

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