Can we use webEngage for flutter web?

Question

I'm trying webEngage with flutter web. I tried adding this script in index.html.

<script id='_webengage_script_tag' type='text/javascript'>
    var webengage;
    ! function(w, e, b, n, g) {
        function o(e, t) {
            e[t[t.length - 1]] = function() {
                r.__queue.push([t.join("."), arguments])
            }
        }
        var i, s, r = w[b],
            z = " ",
            l = "init options track screen onReady".split(z),
            a = "feedback survey notification".split(z),
            c = "options render clear abort".split(z),
            p = "Open Close Submit Complete View Click".split(z),
            u = "identify login logout setAttribute".split(z);
        if (!r || !r.__v) {
            for (w[b] = r = {
                    __queue: [],
                    is_spa: 1, //Change this to 0 if you do not wish to use default SPA behaviour of WebEngage SDK
                    __v: "6.0",
                    user: {}
                }, i = 0; i < l.length; i++) o(r, [l[i]]);
            for (i = 0; i < a.length; i++) {
                for (r[a[i]] = {}, s = 0; s < c.length; s++) o(r[a[i]], [a[i], c[s]]);
                for (s = 0; s < p.length; s++) o(r[a[i]], [a[i], "on" + p[s]])
            }
            for (i = 0; i < u.length; i++) o(r.user, ["user", u[i]]);
            setTimeout(function() {
                var f = e.createElement("script"),
                    d = e.getElementById("_webengage_script_tag");
                f.type = "text/javascript", f.async = !0, f.src = ("https:" == e.location.protocol ? "https://ssl.widgets.webengage.com" : "http://cdn.widgets.webengage.com") + "/js/webengage-min-v-6.0.js", d.parentNode.insertBefore(f, d)
            })
        }
    }(window, document, "webengage");
    webengage.init('myCode'); //replace the YOUR_WEBENGAGE_LICENSE_CODE with your WebEngage Account License Code
</script>

but when calling webengage.init('myCode'); am getting this error.

%cWebEngage%c %cERROR