If you specify a view of the table that contains the image fields in the Items property of the Gallery control, the error "Distinct is not allowed when image attributes are selected." will occur.
I suspect this error is a bug. But I was told that there are no plans to fix it, so I will register with Ideas.
Am also facing the same issue. I think its a bug.
I tried recreating the gallery from the scratch and still facing the error
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