Not Found Page

Next.js provides several built-in error pages. If a page route doesn’t exist, the Not Found page is rendered. Customize it by editing the file src/app/not-found.tsx
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Global Error Page

To create a global error page for all errors, you can use the global-error.tsx file. Customize it by editing the file src/app/global-error.tsx
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You can find more infos about the error pages in the official documentation from Next.js