API response decode fails

[TilBlechschmidt]

Failed to fetch feed!
requestFailed(error: Swift.DecodingError.keyNotFound(
    CodingKeys(stringValue: "thumbnails", intValue: nil),
    Swift.DecodingError.Context(codingPath: [
        CodingKeys(stringValue: "items", intValue: nil),
        _JSONKey(stringValue: "Index 3", intValue: 3),
        CodingKeys(stringValue: "snippet", intValue: nil)
    ],
    debugDescription: "No value associated with key CodingKeys(stringValue: \"thumbnails\", intValue: nil) (\"thumbnails\").", underlyingError: nil)
))