Need help in Schema Error

When I Create Dynamic View using Schema, I Got an Error:

Here is my Schema Code.

{
    "name": "AdsActivity",
    "metadata-version": 1,
    "extension_version": 5,
    "author": "<your name>",
    "platforms": [
        "builder.niotron.com"
    ],
    },
    "keys": [
	"id",
	"amount",
	"mode",
	"date"
	],
    "components": [
        {
            "id": "Card_View1{id}",
            "type": "NiotronCardView",
            "properties": {
                "AlignVertical": 2,
                "CompatPadding": true,
                "ContentPaddingBottom": 0,
                "ContentPaddingLeft": 0,
                "ContentPaddingRight": 0,
                "ContentPaddingTop": 0,
                "Width": -1090
            },
            "components": [
                {
                    "id": "Spacer4{id}",
                    "type": "Spacer",
                    "properties": {
                        "Height": 10
                    }
                },
                {
                    "id": "Horizontal_Arrangement1{id}",
                    "type": "HorizontalArrangement",
                    "properties": {
                        "AlignVertical": 2,
                        "Height": -2,
                        "Width": -2
                    },
                    "components": [
                        {
                            "id": "Spacer1{id}",
                            "type": "Spacer",
                            "properties": {
                                "Width": 8
                            }
                        },
                        {
                            "id": "amount{id}",
                            "type": "Label",
                            "properties": {
                                "CustomFontTypeFace": "RobotoSlab-Regular.ttf",
                                "FontSize": 15,
                                "Text": "{amount}"
                            }
                        },
                        {
                            "id": "Spacer2{id}",
                            "type": "Spacer",
                            "properties": {
                                "Width": -2
                            }
                        },
                        {
                            "id": "mode{id}",
                            "type": "Label",
                            "properties": {
                                "CustomFontTypeFace": "RobotoSlab-Regular.ttf",
                                "FontSize": 15,
                                "Text": "{mode}"
                            }
                        },
                        {
                            "id": "Spacer6{id}",
                            "type": "Spacer",
                            "properties": {
                                "Width": -2
                            }
                        },
                        {
                            "id": "date{id}",
                            "type": "Label",
                            "properties": {
                                "CustomFontTypeFace": "RobotoSlab-Regular.ttf",
                                "FontSize": 15,
                                "Text": "{date}"
                            }
                        },
                        {
                            "id": "Spacer3{id}",
                            "type": "Spacer",
                            "properties": {
                                "Width": 8
                            }
                        }
                    ]
                },
                {
                    "id": "Spacer5{id}",
                    "type": "Spacer",
                    "properties": {
                        "Height": 10
                    }
                }
            ]
        }
    ]
}

Please Help me to solve this error