I am trying to fetch JSON data and later assign it to an array using URLSession. But I am getting an error known as BSMachError: port 9a03; (os/kern) invalid capability (0x14) "Unable to insert COPY_SEND" in the debug area. I have browsed the internet for solution of this error also but did not get any solution yet. I have also check for similar related questions on stack overflow yet not solved my issue. One of the famous asked question is - Error '_BSMachError: port 1607; (os/kern) invalid capability (0x14) "Unable to insert COPY_SEND" in Cordova app on iOS 10 Not sure what's the problem? Please help me friends. Thanks in advance.
Function
func assignData(){
    assignArray = []
    let urlRequest = URLRequest(url: URL(string: Assign_To_URL)!)
    let task = URLSession.shared.dataTask(with: urlRequest) { (data, response, error) in
        if error != nil{
            print(error!)
            return
        }
        print(data!)
        self.assignArray = [assignTo]()
        do{
            let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String: AnyObject]
            if let datafromjson = json["Room"] as? [[String: AnyObject]] {
                print(datafromjson)
                for data in datafromjson{
                    var assign = assignTo()
                    if let id = data["id"] as? Int,
                        let first_name = data["first_name"] as? String,
                        let last_name = data["last_name"] as? String,
                        let name = data["name"] as? String
                    {
                        assign.id = id
                        assign.first_name = first_name
                        assign.last_name = last_name
                        assign.name = name
                    }
                    self.assignArray?.append(assign)
                }
                                    print(self.assignArray)
            }
            DispatchQueue.main.async {
                self.assignToPicker.reloadAllComponents()
            }
        }catch let error {
            print(error)
        }
    }
    task.resume()
}
Error
2018-02-08 13:42:51.586102+0530 LiveApp[22529:223782] [Common] _BSMachError: port 9a03; (os/kern) invalid capability (0x14) "Unable to insert COPY_SEND"
