[GSI_LOGGER]: The value of 'callback' is not a function. Configuration ignored

I'm migrating from Google Sign-in platform to the newer Google Identity Services library.

App.svelte:

<svelte:head><script src="https://accounts.google.com/gsi/client" async defer></script></svelte:head><div id="g_id_onload"     data-client_id="x.apps.googleusercontent.com"     data-callback="handleCredentialResponse"></div><div class="g_id_signin"     data-type="standard"     data-size="large"     data-theme="outline"     data-text="sign_in_with"     data-shape="rectangular"     data-logo_alignment="left"></div>

<script>    function decodeJwtResponse(token) {        let base64Url = token.split('.')[1]        let base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');        let jsonPayload = decodeURIComponent(atob(base64).split('').map(function(c) {            return '%'+ ('00'+ c.charCodeAt(0).toString(16)).slice(-2);        }).join(''));        return JSON.parse(jsonPayload)    }    let responsePayload;    function handleCredentialResponse(response) {        // decodeJwtResponse() is a custom function defined by you        // to decode the credential response.        responsePayload = decodeJwtResponse(response.credential);        console.log("ID: " + responsePayload.sub);        console.log('Full Name: '+ responsePayload.name);        console.log('Given Name: '+ responsePayload.given_name);        console.log('Family Name: '+ responsePayload.family_name);        console.log("Image URL: " + responsePayload.picture);        console.log("Email: " + responsePayload.email);    }</script>

Reloading the page and I saw this error in the console:

[GSI_LOGGER]: The value of 'callback' is not a function. Configuration ignored.

What is the problem?