Scaffolding Error - Requires a primary key to be defined

Here's the class it's referring to
    public class ImageUris
    {
        [JsonPropertyName("small")]
        public string Small { get; set; }

        [JsonPropertyName("normal")]
        public string Normal { get; set; }

        [JsonPropertyName("large")]
        public string Large { get; set; }

        [JsonPropertyName("png")]
        public string Png { get; set; }

        [JsonPropertyName("art_crop")]
        public string ArtCrop { get; set; }

        [JsonPropertyName("border_crop")]
        public string BorderCrop { get; set; }
    }


I'll be honest I've read the key info in the error link and don't exactly understand what all of this means. I don't quite understand how keys work either.
unknown.png
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