ios – Swift 5: Error in success/failure block “‘catch’ block is unreachable as a result of no errors are thrown in ‘do’ block”

I’m writing a closure with error dealing with, however I get a warning “‘catch’ block is unreachable as a result of no errors are thrown in ‘do’ block” within the catch line.
That is my code:

class Service {
func graphQL(physique: [String:Any], onSuccess: @escaping (Basis.Information) -> (), onFailure: @escaping (Error) -> ()) {
    var request = URLRequest(url: url)
    
    request.httpMethod = "POST"
    request.setValue("utility/json", forHTTPHeaderField: "Content material-Sort")

    request.httpBody = strive? JSONSerialization.knowledge(withJSONObject: physique, choices: .fragmentsAllowed)
    
    URLSession.shared.dataTask(with: request) { (knowledge, response, error) in
        if let error = error {
            onFailure(error)
        }

        if let knowledge = knowledge {
            do{
                onSuccess(knowledge)
            }
            catch{
                onFailure(error)
            }
        }
    }.resume()
}


class TimeDepositManager {
func getTimeDeposits(onSuccess: @escaping ([TimeDeposits]) -> (), onFailure: @escaping (Error) -> ()) {
    let physique = ["query": "{ account { timeDeposits { returnAmount interestRate dueDate originalAmount id startDate currency } } }"
    ]

    Service().graphQL(physique: physique, onSuccess: { knowledge in
        let json = strive? JSONDecoder().decode(GraphQLResponse.self, from: knowledge)
        onSuccess(json?.knowledge?.account?.timeDeposits ?? [])
    }, onFailure: { error in
        print(error)
    })
}

I would like the logic of onSuccess within the func getTimeDeposits(), however how take away this catch block warning?