diff --git a/app/src/main/java/com/example/cosmosclient/entities/JoinGroupResponse.java b/app/src/main/java/com/example/cosmosclient/entities/JoinGroupResponse.java
index 45aad80..8b297d0 100644
--- a/app/src/main/java/com/example/cosmosclient/entities/JoinGroupResponse.java
+++ b/app/src/main/java/com/example/cosmosclient/entities/JoinGroupResponse.java
@@ -1,14 +1,15 @@
 package com.example.cosmosclient.entities;
 
 import java.lang.reflect.Member;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 public class JoinGroupResponse {
 
-    public List<Member> member;
+    public List<User> member=new ArrayList<>();;
 
-    public List<Member> getListMembers() {
+    public List<User> getListMembers() {
         return member;
     }
 
diff --git a/app/src/main/java/com/example/cosmosclient/views/JoinGroupByIDActivity.java b/app/src/main/java/com/example/cosmosclient/views/JoinGroupByIDActivity.java
index 96d34fa..31661e1 100644
--- a/app/src/main/java/com/example/cosmosclient/views/JoinGroupByIDActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/JoinGroupByIDActivity.java
@@ -12,6 +12,7 @@
 import com.example.cosmosclient.R;
 import com.example.cosmosclient.app.Cosmos;
 import com.example.cosmosclient.entities.JoinGroupResponse;
+import com.example.cosmosclient.entities.User;
 import com.example.cosmosclient.resources.JoinGroupRest;
 
 import java.lang.reflect.Member;
@@ -70,7 +71,7 @@
                     @Override
                     public void onResponse(Call<JoinGroupResponse> call, Response<JoinGroupResponse> response) {
                         if (response.isSuccessful()) {
-                            List<Member>listMembers= response.body().getListMembers();
+                            List<User>listMembers= response.body().getListMembers();
                             int s = listMembers.size();
                             for(int i = 0; i < s; i++){
                             Log.d("debug3", String.valueOf(listMembers.get(i)));
diff --git a/app/src/main/java/com/example/cosmosclient/views/QRcodeReadingActivity.java b/app/src/main/java/com/example/cosmosclient/views/QRcodeReadingActivity.java
index 381f10d..bb8c927 100644
--- a/app/src/main/java/com/example/cosmosclient/views/QRcodeReadingActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/QRcodeReadingActivity.java
@@ -12,6 +12,7 @@
 import com.example.cosmosclient.R;
 import com.example.cosmosclient.app.Cosmos;
 import com.example.cosmosclient.entities.JoinGroupResponse;
+import com.example.cosmosclient.entities.User;
 import com.example.cosmosclient.resources.JoinGroupRest;
 import com.google.zxing.integration.android.IntentIntegrator;
 import com.google.zxing.integration.android.IntentResult;
@@ -89,7 +90,7 @@
             @Override
             public void onResponse(Call<JoinGroupResponse> call, Response<JoinGroupResponse> response) {
                 if (response.isSuccessful()) {
-                    List<Member> listMembers= response.body().getListMembers();
+                    List<User> listMembers= response.body().getListMembers();
                     int s = listMembers.size();
                     for(int i = 0; i < s; i++){
                         Log.d("debug3", String.valueOf(listMembers.get(i)));