I keep having errors trying to deploy my Nextjs app to vercel:
Error occurred prerendering page "/". Read more: https://nextjs.org/docs/messages/prerender-error
TypeError: (0 , react_development_.useState) is not a function or its return value is not iterable
at Categories (/vercel/path0/.next/server/chunks/930.js:122:72)
at d (/vercel/path0/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:33:498)
at bb (/vercel/path0/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:36:16)
at a.b.render (/vercel/path0/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:42:43)
at a.b.read (/vercel/path0/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:41:83)
at Object.exports.renderToString (/vercel/path0/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:52:138)
at Object.renderPage (/vercel/path0/node_modules/next/dist/server/render.js:686:46)
at Object.defaultGetInitialProps (/vercel/path0/node_modules/next/dist/server/render.js:316:51)
at Function.getInitialProps (/vercel/path0/.next/server/pages/_document.js:514:20)
at Object.loadGetInitialProps (/vercel/path0/node_modules/next/dist/shared/lib/utils.js:69:29)
I tried npm run build locally and I get this error:
> Build error occurred
Error: Export encountered errors on following paths:
/
/post/[slug]: /post/first-post
/post/[slug]: /post/how-html-css-js-work
/post/[slug]: /post/nextjs
/post/[slug]: /post/react-hooks
So I assume it has to be something inside my index page and /post/[slug] page. I tried everything like setting getStaticPaths fallback to false and using optional chaining everywhere but I still get the error.
Can someome please help me out, it is so depressing when I finished the project and I can run it in my localhost but and failed in the deployment/build time.
My / page:
import Head from "next/head";
import { PostCard, Categories, PostWidget } from "../components";
import { getPosts } from "../services";
export default function Home({ posts }) {
const sortedPosts = posts.sort(
(a, b) => new Date(b.node.createdAt) - new Date(a.node.createdAt)
);
return (
<>
<Head>
<title>JBLOG | Home</title>
</Head>
<section className="bg-zinc-200 dark:bg-gray-500 transition-colors px-5">
<div className="max-w-7xl mx-auto py-10">
<div className="grid grid-cols-1 md:grid-cols-12 gap-12">
<div className="md:col-span-8 col-span-1 ">
{sortedPosts?.map((post) => (
<PostCard key={post.node.title} post={post.node} />
))}
</div>
<div className="md:col-span-4 col-span-1">
<div className="md:sticky relative md:top-[110px]">
<PostWidget />
<Categories />
</div>
</div>
</div>
</div>
</section>
</>
);
}
export async function getStaticProps() {
const posts = (await getPosts()) || [];
return {
props: {
posts,
},
};
}
My /post/slug page:
import React from "react";
import Head from "next/head";
import { getPosts, getPostDetails } from "../../services";
import {
PostDetail,
Categories,
PostWidget,
Author,
Comments,
CommentsForm,
} from "../../components";
import { useRouter } from "next/router";
const Post = ({ post }) => {
const router = useRouter();
if (router.isFallback) {
return <div>Loading...</div>;
}
return (
<>
<Head>
<title>{post?.title}</title>
</Head>
<section className="bg-zinc-200 dark:bg-gray-500 transition-colors px-5">
<div className="max-w-7xl mx-auto py-10">
<div className="grid grid-cols-1 md:grid-cols-12 md:gap-6">
<div className="md:col-span-8 col-span-1 ">
<PostDetail post={post} />
<CommentsForm slug={post?.slug} />
<Comments slug={post?.slug} />
</div>
<div className="md:col-span-4 col-span-1">
<div className="md:sticky relative md:top-[110px]">
<Author author={post?.author} />
<PostWidget
slug={post?.slug}
categories={post?.categories?.map(
(category) => category.slug
)}
/>
<Categories />
</div>
</div>
</div>
</div>
</section>
</>
);
};
export default Post;
export const getStaticProps = async (context) => {
const data = await getPostDetails(context.params.slug);
return {
props: {
post: data,
},
};
};
export const getStaticPaths = async () => {
const posts = await getPosts();
return {
paths: posts.map((post) => ({ params: { slug: post.node.slug } })),
fallback: true,
};
};
useStatebut the code you posted has no reference to it. Can you post the component(s) where you use theuseStatehook? Most likelyCategoriesorPostWidgetas they are both common to the erroring routes.