fething data from Firebase using listview in andriod studio [duplicate]

Question

my app is crushing , can anyone tell what is the problem ??

** error is : 2022-05-19 11:54:40.455 6609-6609/com.example.adapterclasswitsimpleoverview E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.adapterclasswitsimpleoverview, PID: 6609 com.google.firebase.database.DatabaseException: Failed to convert value of type java.util.HashMap to String at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertString(CustomClassMapper.java:426) at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToClass(CustomClassMapper.java:217) **

code: ** public class MainActivity extends AppCompatActivity {

// creating variables for our list view.
 ListView coursesLV;
ArrayList<String> coursesArrayList=new ArrayList<>();
FirebaseDatabase database = FirebaseDatabase.getInstance("https://newcode-c147f-default-rtdb.firebaseio.com/");
DatabaseReference myRef = database.getReference("User");

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ArrayAdapter<String> myArrayAdapter= new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1,coursesArrayList);
    coursesLV = findViewById(R.id.idl);
    coursesLV.setAdapter(myArrayAdapter);
    myRef.addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
        String value=snapshot.getValue(String.class);
        coursesArrayList.add(value);
        myArrayAdapter.notifyDataSetChanged();
        }
enter code here
        @Override
        public void onChildChanged(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {
            myArrayAdapter.notifyDataSetChanged();
        }

        @Override
        public void onChildRemoved(@NonNull DataSnapshot snapshot) {

        }

        @Override
        public void onChildMoved(@NonNull DataSnapshot snapshot, @Nullable String previousChildName) {

        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {

        }
    });



}

}**

<ListView
    android:id="@+id/idl"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />