Expecting member declaration with kotlin - kotlin

Question

First, I'm sorry to use a translator because I can't speak English.
I tried to implement app server communication through retrofit.
But I got this error for the next code.
service.getinfo()?.enqueue(object : Callback<student> {//22
override fun onResponse(call: Call<student>, response: Response<student>) {
if(response.isSuccessful){
var result: student? = response.body()
Log.d("YMC", "onResponse 성공: " result?.toString())//27
}else{
// 통신이 실패한 경우(응답코드 3xx, 4xx 등)
Log.d("YMC", "onResponse 실패")
}
}
Expecting member declaration :22
Expecting member declaration :22
Expecting member declaration :22
Name expected :22
Unresolved reference: result :27
Expecting an element :27
Expecting an expression :27
Property "service" is never used :20
Variable 'result' is never used :26
I couldn't figure out exactly what the problem was because I wrote the example code without the variable name to learn the basic usage of retrofit.
This is my main activity.
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
val retrofit = Retrofit.Builder().baseUrl("myserverURL")
.addConverterFactory(GsonConverterFactory.create()).build()
val service = retrofit.create(StudentService::class.java)
service.getinfo()?.enqueue(object : Callback<student> {
override fun onResponse(call: Call<student>, response: Response<student>) {
if(response.isSuccessful){
var result: student? = response.body()
Log.d("YMC", "onResponse 성공: " result?.toString())
}else{
// 통신이 실패한 경우(응답코드 3xx, 4xx 등)
Log.d("YMC", "onResponse 실패")
}
}
override fun onFailure(call: Call<student>, t: Throwable) {
TODO("Not yet implemented")
}
}
}
This is the content of the student data class.
data class student(
#SerializedName("id") val id:Int,
#SerializedName("hashedPW") val hashedPW:Char,
#SerializedName("hp") val hp:Char,
#SerializedName("name") val name:Char
)
This is an interface to communicate with the server
interface StudentService {
#GET("info/studentList")
fun getinfo(): Call<student>
}