The string did not match the expected pattern

<script lang="ts">
    export let data;
    import { createTRPCClient, httpBatchLink } from "@trpc/client";
    import type { AppRouter } from "bot/src/trpc";

    const trpc = createTRPCClient<AppRouter>({
        links: [
            httpBatchLink({
                url: "https://[redacted]-ngrok.app",
            }),
        ],
    });

    setTimeout(async () => {
        console.log("starting to wait");
        try {
            const result = await trpc.SimplePong.query("hoi");
        } catch (e) {
            console.error(e);
        }
        console.log("done waiting");
    }, 1000);
</script>