cannot use an empty list to initialize a new field

Do I have an optional array type field such as [Int]? How to fix this error

No file, test, or entry point is named. Start by reproducing the optional [Int] field case with an empty list and trace how CloudKitCodable encodes or initializes that field. Done means the reported error is understood and an empty list can initialize the optional array field, with a regression test if the project’s test structure supports it.

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