DatabaseException：将项目添加到arraylist时，无法使用类解析节点

Question

我正在像下面的代码那样从Firebase数据库中获取数据数组，然后将一个项目添加到该数组列表中

FirebaseDatabase.getInstance().getReference().child("CategoryWallpaper").addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

                    GenericTypeIndicator<List<WallpaperItem>> t = new GenericTypeIndicator<List<WallpaperItem>>(){};

                    List<WallpaperItem> yourStringArray = dataSnapshot.getValue(t);

                    WallpaperItem wallpaperItem = new WallpaperItem();
                    wallpaperItem.setCategoryId("Love");
                    wallpaperItem.setViewCount(-200);
                    wallpaperItem.setImageLink("https://www.google.com");
                    yourStringArray.add(wallpaperItem);

FirebaseDatabase.getInstance().getReference().child("CategoryWallpaper").setValue(yourStringArray, new OnSuccessListener<Void>() {
                            @Override
                            public void onSuccess(Void aVoid) {
                                Toast.makeText(MainActivity.this, "Success", Toast.LENGTH_SHORT).show();
                            }
                        }).addOnFailureListener(new OnFailureListener() {
                            @Override
                            public void onFailure(@NonNull Exception e) {
                                e.printStackTrace();
                            }
                        });
                    }

我的数据库如下所示

将项目添加到数组列表后，我已经在调试模式下完成了代码检查，我看到了以下结果-该记录已添加到580的ArrayList中

但是我在下面一行出现错误

FirebaseDatabase.getInstance().getReference().child("CategoryWallpaper").setValue(yourStringArray

错误如下所示

com.google.firebase.database.DatabaseException: Failed to parse node with class class .MainActivity$2$3
        at com.google.firebase.database.snapshot.NodeUtilities.NodeFromJSON(com.google.firebase:firebase-database@@16.0.6:103)
        at com.google.firebase.database.snapshot.NodeUtilities.NodeFromJSON(com.google.firebase:firebase-database@@16.0.6:28)
        at com.google.firebase.database.snapshot.PriorityUtilities.parsePriority(com.google.firebase:firebase-database@@16.0.6:39)
        at com.google.firebase.database.DatabaseReference.setValue(com.google.firebase:firebase-database@@16.0.6:207)
        at MainActivity$2.onDataChange(MainActivity.java:151)