Here is my code 

func getToken() {

        let client = BoxSDK.getClient(token: "My developer token")

        client.users.getCurrent(fields:n"name", "login"]) { (result: Result<User,

          BoxSDKError>) in

            print(result)

          guard case let .success(user) = result else {

              print("Error getting user information")

              return

          }

            print("Authenticated as \(String(describing: user.name))")

        }

        sleep(5)

    }

getting this error :

GET https://api.box.com/2.0/users/me?fields=name,login

▷ Headers: 

    ▷ X-Box-UA, Value: agent=box-swift-sdk/3.1.0; env=iPhone Simulator/13.4.1

    ▷ Authorization, Value: Bearer REDACTED

▷ Body:

2021-09-14 16:51:55.269912+0530 BoxIntegrations17767:939307] /NETWORK AGENT] 

◁ Status code: 401: unauthorized

◁ Headers: 

    ◁ Strict-Transport-Security, Value: max-age=31536000

    ◁ box-request-id, Value: 0856d81a3ad577e175ac3e38a9cfd72d1

    ◁ x-envoy-upstream-service-time, Value: 54

    ◁ Connection, Value: keep-alive

    ◁ Cache-Control, Value: no-cache, no-store

    ◁ Transfer-Encoding, Value: Identity

    ◁ Content-Type, Value: application/json

    ◁ Www-Authenticate, Value: Bearer realm="Service"

    ◁ Date, Value: Tue, 14 Sep 2021 11:21:55 GMT

◁ Body: {"type":"error","status":401,"code":"unauthorized","help_url":"http:\/\/developers.box.com\/docs\/#errors","message":"Unauthorized - Cannot authorize with this service","request_id":"wcte3xgugdlacg92"}