Kotlin Jsoup web scrapping

Question

I'm practicing with Kotlin/Jsoup but I don't know what's wrong

Code to get:

                <div class="player-container">

                    <script>
                        var tabsArray = new Object();
                                                        tabsArray['1'] = "<iframe width='100%' height='100%' src='/redirect.php?player=9&amp;code=LmdHOcKJ4LMy3D5VQ8Nk1QxqZ4wPR2ni6nL8OMtdRHY&amp;' frameborder='0' noresize scrolling='no' allowfullscreen></iframe>";
                                                </script>

                    <div class="iframe-container" id="video_player">

                    </div>

My code:

app.get(data).document.select("is-9-desktop").forEach {
            val urlDecoded = it.select("iframe").attr("src:containsOwn(redirect.php?player=9&)")
            val url2 = (urlDecoded).replace("code=", "https://www.fembed.com/v/")
            val url = (url2).substring(0,url2.indexOf("&thumbnail="));
            if (url.startsWith("https://www.fembed.com")) {
                val extractor = FEmbed()
                extractor.getUrl(url).forEach { link ->
                    callback.invoke(link)
                }