问Swift在使用firebase时显示预期的声明错误

EN

 guard fullNameTextField.text != "", emailTextField.text != "", passwordTextField.text != "", confirmPasswordTextField.text != ""
        else {
            return
    }

    }

if passwordTextField.text == confirmPasswordTextField.text {
//MARK: Firebase autenthication
FIRAuth.auth()?.createUser(withEmail: emailTextField.text!, password: passwordTextField.text!, completion:{
(user,error)in

if let error = error {
print(error.localizedDescription)
}