Here is the patch to solve the error in the title, obtain when running the first npm run dev command of the tutorial:
`
diff -ruN pages/_app.js.orig pages/_app.js
--- pages/_app.js.orig 2023-01-21 14:53:09.445917996 +0100
+++ pages/_app.js 2023-01-21 14:50:24.415662655 +0100
@@ -1,7 +1,7 @@
import '@/styles/globals.css';
import { Provider } from "@self.id/react";
-function MyApp({ Component, pageProps }) {
+export default function MyApp({ Component, pageProps }) {
return (
<Provider client={{ ceramic: "testnet-clay" }}>
<Component {...pageProps} />;
`