Cannot resolve symbol 'userPass' 오류

Question

public class loginfrom extends AppCompatActivity {
    private Button btn_loginform;
    private Button btn_loginform_signup;

    private EditText sign_id, sign_pass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_loginform);

        sign_id = findViewById(R.id.sign_id);
        sign_pass = findViewById(R.id.sign_pass);


        btn_loginform=findViewById(R.id.btn_loginform);
        btn_loginform.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String userID = sign_id.getText().toString();
                String userPassword = sign_pass.getText().toString();

                Response.Listener<String> responseListener = new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            boolean success = jsonObject.getBoolean("success");

                            if (success) { //회원 등록 성공
                                String userID = jsonObject.getString("user_id");
                                String userPass = jsonObject.getString("user_pass");

                                Toast.makeText(getApplicationContext(), "로그인 성공!", Toast.LENGTH_SHORT).show();
                                Intent intent = new Intent(loginfrom.this, Signup_home.class);
                                intent.putExtra("user_id", userID);
                                intent.putExtra("user_pass", userPass);
                                startActivity(intent);
                            } else { //회원 등록 실패
                                Toast.makeText(getApplicationContext(), "로그인 실패!", Toast.LENGTH_SHORT).show();
                                return;
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                };

                LoginRequest loginRequest = new LoginRequest(userID, userPass, responseListener);
                RequestQueue queue = Volley. newRequestQueue(loginfrom.this);
                queue.add(loginRequest);
            }
        });

        btn_loginform_signup=findViewById(R.id.btn_loginform_signup);
        btn_loginform_signup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(loginfrom.this, Signup.class);
                startActivity(intent);
            }
        });
    }
}

코드는 이러한데 자꾸만 Cannot resolve symbol 'userPass' << 이러한 에러가 뜹니다 어디가 문제일까요?

Answer 1

에러는 아니고 경고만 나오는 거죠?
Gradle sync now를 누르거나 clean build 하고 나서 rebuild 해보거나 안드로이드 스튜디오 재시작 해보세요.
이건 안드로이드 스튜디오 버그예요.