Trouble with viewbinder simplecursortreeadapter -unable to convert string to blob

[errahby]

I have pictures in my sqlite prepopulated database, i'm using Simplecursortreeadapter to pass data to exepndablelistview , but the app crush when opening a childview with a picture and in logcat i got "UNABLE TO CONVERT STRING TO BLLOB'.
After making some research on internet i discovered(maybe) i have to implement viewbinder which i did ( copy past and addapt to my columns) ..what i have done is based on the answer of this question:https://stackoverflow.com/questions/30388843/unable-to-convert-blob-to-string-using-loadermanager-in-android ..

But The app can't build successfuly now...i think i'm missing something or there is something wrong with my code:

Please help! thanks

    public class MainActivity extends AppCompatActivity {
        ExpandableListView expandableListView;
        Database mDatabase;
 
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
 
            mDatabase = new Database(this);
            mDatabase.open();
 
            SimpleCursorTreeAdapter.setViewBinder( new MyViewBinder());
 
            Cursor cursor = mDatabase.getDatabase();
            startManagingCursor(cursor);
 
            String[] childFrom = new String[]{Database.DATABASE_CHILD_1,Database.DATABASE_CHILD_2};
            String[] groupFrom = new String[]{Database.DATABASE_GROUP_1};
 
            int[] groupTo = {R.id.group1};
            int[] childTo = {R.id.child1,R.id.child2};
 
            SimpleCursorTreeAdapter simplecursortreeAdapter = new ExpandableListViewAdapter(
                    this,
                    cursor,
                    R.layout.list_group,
                    groupFrom,
                    groupTo,
                    R.layout.list_child,
                    childFrom,
                    childTo
            );
 
            expandableListView = findViewById(R.id.expandableListview);
            expandableListView.setAdapter(simplecursortreeAdapter);
        }
 
        protected void onDestroy() {
            super.onDestroy();
            mDatabase.close();
        }
 
        public class MyViewBinder implements ViewBinder {
            @Override
            public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
                int viewID = view.getId();
                switch(viewID){
                    case R.id.child1 :
                        TextView friendName = (TextView) view;
                        String friend_name;
                        friend_name = cursor.getString(cursor.getColumnIndex(Database.DATABASE_CHILD_1));
                        friendName.setText(friend_name);
                        break;
 
                    case R.id.child2 :
                        ImageView contactProfile = (ImageView) view;
                        byte[] imageBytes = cursor.getBlob(cursor.getColumnIndex(Database.DATABASE_CHILD_2));
                        if(imageBytes != null ){
                            // Pic image from database
                            contactProfile.setImageBitmap(BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length));
                        }else {
                            // If image not found in database , assign a default image
                            contactProfile.setBackgroundResource(R.drawable.disorders);
                        }
                        break;
                }
                return true;
            }
 
        }
 
        private class ExpandableListViewAdapter extends SimpleCursorTreeAdapter {
            private ExpandableListViewAdapter(
                    Context context,
                    Cursor cursor,
                    int groupLayout,
                    String[] groupFrom,
                    int[] groupTo,
                    int childLayout,
                    String[] childFrom,
                    int[] childTo) { super(context, cursor, groupLayout, groupFrom, groupTo, childLayout, childFrom, childTo); }
 
            protected Cursor getChildrenCursor(Cursor groupCursor) {
                return mDatabase.getID(groupCursor.getInt(groupCursor.getColumnIndex(Database.DATABASE_ID)));
            }
 
        }
 
 
    }