I have an API class in which I am creating a URL session data task that updates the value of a birdResult property in the class when the task completes from within a DispatchQueue.main.async block.

In Swift 6, the following error appears:

My class code looks like this:

class BirdsAPI: ObservableObject {
    static let url = URL(string: "https://api.inaturalist.org/v1/observations?iconic_taxa=Aves&per_page=50&order=desc&order_by=created_at")
    
    @Published var birdResults: [BirdResult] = []
    
    func fetchObservations() {
        URLSession.shared.dataTask(with: URLRequest(url: BirdsAPI.url!)) { data, response, error in
            guard error == nil else { return }
            
            let decoder = JSONDecoder()
            
            do {
                let body = try decoder.decode(Body.self, from: data!)
                DispatchQueue.main.async {
                    self.birdResults = body.results
                }
            } catch let error {
                print("error decoding data, (error)")
            }
        }.resume()
    }
}

Why is this and how can I fix it?