The error suggests your Astro site’s deployment to Vercel is missing a required config file. Here’s how to fix it:

Add vercel.json: Ensure a vercel.json file exists in your project root. Create one if missing. Rebuild Project: Run npm run build to rebuild your site. Verify Setup: Check your Vercel dashboard to confirm the project is properly linked. Install Dependencies: Ensure all required packages are listed in package.json and installed. Use Vercel CLI: Deploy using the CLI with vercel --prod. Check Logs: Review Vercel’s build logs for errors or warnings.