git init

app/dashboard/invoices/[id]/edit/not-found.tsx

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+import Link from 'next/link';
+import { FaceFrownIcon } from '@heroicons/react/24/outline';
+
+export default function NotFound() {
+    return (
+        <main className="flex h-full flex-col items-center justify-center gap-2">
+            <FaceFrownIcon className="w-10 text-gray-400" />
+            <h2 className="text-xl font-semibold">404 Not Found</h2>
+            <p>Could not find the requested invoice.</p>
+            <Link
+                href="/dashboard/invoices"
+                className="mt-4 rounded-md bg-blue-500 px-4 py-2 text-sm text-white transition-colors hover:bg-blue-400"
+            >
+                Go Back
+            </Link>
+        </main>
+    );
+}

app/dashboard/invoices/[id]/edit/page.tsx

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+import Form from '@/app/ui/invoices/edit-form';
+import Breadcrumbs from '@/app/ui/invoices/breadcrumbs';
+import {fetchCustomers, fetchInvoiceById} from '@/app/lib/data';
+import {notFound} from 'next/navigation';
+import {Metadata} from 'next';
+
+export const metadata: Metadata = {
+    title: 'Edit Invoice',
+}
+
+export default async function Page(props: {
+    params: Promise<{ id: string }>
+}) {
+    const params = await props.params;
+    const { id } = params;
+
+    const [invoice, customers] = await Promise.all([
+        fetchInvoiceById(id),
+        fetchCustomers()
+    ]);
+
+    if (!invoice) return notFound();
+
+    return (
+        <main>
+            <Breadcrumbs
+                breadcrumbs={[
+                    { label: 'Invoices', href: '/dashboard/invoices' },
+                    {
+                        label: 'Edit Invoice',
+                        href: `/dashboard/invoices/${id}/edit`,
+                        active: true,
+                    },
+                ]}
+            />
+            <Form invoice={invoice} customers={customers} />
+        </main>
+    );
+}