{
    "data2": {
        "error": {
            "code": 101,
            "message": "operation failed!"
        },
        "result": {
            "backgrounds": [
                "test1.png",
                "test2.png",
                "test3.png"
            ]
        }
    },
    "error": {
        "code": 101,
        "message": "operation failed!"
    },
    "result": {
        "backgrounds": [
            "test1.png",
            "test2.png",
            "test3.png"
        ]
    }
}