Can anyone tell me why my Complex Modification is not working?

[computerstimulation]

I'm receiving an error message.

{
    "title": "F7 and F9 YouTube Control Apps",
    "rules": [
        {
            "description": "Remap F7 to launch rewind Safari video app",
            "manipulators": [
                {
                    "type": "basic",
                    "from": {
                        "key_code": "f7"
                    },
                    "to": [
                        {
                            "shell_command": "open /Applications/rewindsafarivideo10seconds.app"
                        }
                    ]
                }
            ]
        },
        {
            "description": "Remap F9 to launch forward Safari video app",
            "manipulators": [
                {
                    "type": "basic",
                    "from": {
                        "key_code": "f9"
                    },
                    "to": [
                        {
                            "shell_command": "open /Applications/forwardsafarivideo10seconds.app"
                        }
                    ]
                }
            ]
        }
    ]
}

[computerstimulation]

This is the corrected code:

I went an indirect route of running my applications which was to create an automation script (Quick Action) that runs the applications > creating a keyboard shortcut for that in System Settings > using Karabiner-Elements to re-map the F7 and F9 keys to that keyboard shortcut (fn + F7 and fn + F9, respectively)

{
    "description": "Remap F7 to fn + F7 and F9 to fn + F9",
    "manipulators": [
        {
            "from": {
                "key_code": "f7"
            },
            "to": [
                {
                    "key_code": "f7",
                    "modifiers": ["fn"]
                }
            ],
            "type": "basic"
        },
        {
            "from": {
                "key_code": "f9"
            },
            "to": [
                {
                    "key_code": "f9",
                    "modifiers": ["fn"]
                }
            ],
            "type": "basic"
        }
    ]
}