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Lovable errors and fixes

Errors in apps built with Lovable (React + Vite, often with Supabase): blank screens, broken imports, failed fetches and Edge Functions.

6 Lovable errors below. Each page shows the exact error text, what it means, likely causes and a step-by-step fix.

• Lovable app shows a blank white page after deploying elsewhere
  Lovable projects are Vite + React apps.
• Lovable/Vite: Failed to resolve import
  Vite cannot find a file the code imports, often after the AI renamed or deleted a component..
• TypeError: Cannot read properties of undefined (reading 'map')
  Code called .map() on a value that is undefined, usually data that hasn't loaded yet or a response with a different shape than expected.
• Edge Function returned a non-2xx status code
  supabase.functions.invoke() reached your Supabase Edge Function, but the function responded with an error status.
• Unexpected token '<', "<!DOCTYPE "... is not valid JSON
  Your code called response.json(), but the server returned an HTML page (often a 404 page or index.html) instead of JSON..
• TypeError: Failed to fetch dynamically imported module
  The browser could not download a lazy-loaded JavaScript chunk (a route or component loaded with import() or React.lazy).

Related error categories

• Serverless & Edge Function errors: 4 pages
• Lovable & Bolt app errors: 9 pages

Not sure which one you have? Take the quiz →

Other platforms

Next.js · Vercel · Supabase · Stripe · Cursor · Bolt · Replit