ios – Call to main actor-isolated instance method ‘setUserToken’ in a synchronous nonisolated context

I have the following code

   APICaller.sharedInstance.performCallToEndpoint("/user/session", using: "GET", body: nil) { (error, serverError, response) -> () in
            if let response = response {
                self.setUserToken(response);
                completion(true)
            } else {
                completion(false)
            }
        }

Where I’m calling setUserToken I get the error Call to main actor-isolated instance method 'setUserToken' in a synchronous nonisolated context.

Here’s the code for performCallToEndpoint

APICaller {

    func performCallToEndpoint(_ endpoint:String, using method:String, body: [String: Any]?, completion: @escaping (_ error:Error?, _ serverError: String?, _ response: NSDictionary?) -> Void) {
        
    
        let request = createURLRequest(toEndpoint: endpoint, using:method, body: body)
        
        URLSession.shared.dataTask(with: request) { data, response, error in
            guard error == nil else {
                print("Error: error calling POST")
                completion(error, nil, nil)
                return
            }
            guard let data = data else {
                print("Error: Did not receive data")
                completion(nil, nil, nil)
                return
            }
            guard let response = response as? HTTPURLResponse, (200 ..< 299) ~= response.statusCode else {
                print("Error: HTTP request failed")
                completion(nil, nil, nil)
                return
            }
            do {
                guard let jsonObject = try JSONSerialization.jsonObject(with: data, options: []) as? NSDictionary else {
                    return
                }
    
                let responseError = jsonObject["error"] as? String
                    
                if responseError?.count != nil {
                    completion(nil, responseError, nil)
                } else {
                    if (jsonObject["result"] == nil) {
                        completion(nil, nil, jsonObject as! NSDictionary)
                    } else {
                        completion(nil, nil, jsonObject["result"] as! NSDictionary)
                    }
                }
            } catch {
                print("Error: Trying to convert JSON data to string")
                return
            }
        }.resume()
    }
}

What am I doing wrong? I’m not able to build my swift project after upgrading to the latest version of Xcode.