ios – 尝试使用firebase验证电话号码时出现“无效令牌”

import FirebaseAuth


class AuthPhoneNum {

    static func getPhoneNum(phoneNumber: String) {
        PhoneAuthProvider.provider().verifyPhoneNumber(phoneNumber) { (verificationID,error) in
            if let error = error {
                print(error)
                return
            }
            UserDefaults.standard.set(verificationID,forKey: "authVerificationID")
        }
    }

    static func verify(verificationCode: String?) {
        guard let verificationID = UserDefaults.standard.string(forKey: "authVerificationID") else { return }
        if verificationCode != nil {
            let credential = PhoneAuthProvider.provider().credential(
                withVerificationID: verificationID,verificationCode: verificationCode!)

            Auth.auth().signIn(with: credential) { (user,error) in
                if let error = error {
                    print(error)
                    return
                }
            }
        } else {
            print("No verification code")
        }
    }

}

这是控制台打印出来的：

Error Domain=FIRAuthErrorDomain Code=17048 “Invalid token.”
UserInfo={NSLocalizedDescription=Invalid token.,
error_name=INVALID_APP_CREDENTIAL}

我究竟做错了什么？谢谢