Error when trying to import Freshworks stylesheet

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I am currently trying to import the Freshworks styltesheet as described in
https://developers.freshworks.com/docs/app-sdk/v3.0/common/app-ui/
in my Custom App installation page:

<!DOCTYPE html>
<html lang="en">

    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />

        <script type="module" src="https://cdn.jsdelivr.net/npm/@freshworks/crayons@v4/dist/crayons/crayons.esm.js"></script>
        <link rel="stylesheet" type="text/css" href="https://static.freshdev.io/fdk/2.0/assets/freshworks.css">

        <link rel="stylesheet" href="./assets/iparams.css" />

        <script src="{{{appclient}}}"></script>
        <script src="./assets/iparams.js"></script>

    </head>
...

But when I load the page, an error is logged to the console
grafik
and the elements on the page are not loaded anymore. Did I do something wrong?