Could not use with Slim4

[harpreetsb]

Hi, I am trying to use this with Slim4 framwork and looks like after installing slim with following setps, I could not run composer require cboden/ratchet. I get the error

Please help

[harpreetsb]

composer.json looks like this

{
    "require": {
        "slim/slim": "4.*",
        "slim/psr7": "^1.4",
        "nyholm/psr7": "^1.4",
        "nyholm/psr7-server": "^1.0",
        "guzzlehttp/psr7": "^2.0",
        "http-interop/http-factory-guzzle": "^1.2",
        "laminas/laminas-diactoros": "^2.6"
    },
    "autoload": {
        "psr-4": {
            "Controlers\\": "app/Controllers",
            "Routes\\": "app/Routes"
        }
    }
}