# FixKit AI > Plain-English fixes for errors in AI-built apps (Cursor, Lovable, Bolt, Replit, Next.js, React, npm, Python). ## Tools - [Free Error Fixer](https://fixkit-ai.netlify.app/products/error-fixer.html): paste an error, get a fix checklist. Free, client-side. ## Products - [Fix Pack, top 50 errors ($9)](https://fixkit-ai.netlify.app/products/error-fixer.html) - [Debug & Fix Prompt Pack ($9); more prompt packs coming](https://fixkit-ai.netlify.app/products/prompt-packs.html) - [Research Assistant Agent Starter Kit ($19); more kits coming](https://fixkit-ai.netlify.app/products/agent-kits.html) ## Guides - [Fix "Error: Cannot find module" in Node, Next.js & Cursor projects](https://fixkit-ai.netlify.app/guides/cannot-find-module.html) - [Fix "Hydration failed because the initial UI does not match" in Next.js](https://fixkit-ai.netlify.app/guides/hydration-failed.html) - [Fix CORS Errors When Calling an API from Lovable (or Any Frontend)](https://fixkit-ai.netlify.app/guides/cors-error-lovable-api.html) - ["Module not found: Can't resolve": A 60-Second Checklist for AI-Generated Code](https://fixkit-ai.netlify.app/guides/module-not-found-checklist-ai-code.html) - [Fix "Hydration failed" in Next.js Apps Built with Cursor or v0](https://fixkit-ai.netlify.app/guides/nextjs-hydration-failed-cursor-v0.html) - [Fix npm ERESOLVE "unable to resolve dependency tree"](https://fixkit-ai.netlify.app/guides/npm-eresolve-peer-dependency.html) - [Supabase RLS Errors in Lovable and Bolt Apps (and How to Fix Them Safely)](https://fixkit-ai.netlify.app/guides/supabase-rls-errors-lovable-bolt.html) - [Replit Agent Stuck or Looping? Prompts That Unstick It](https://fixkit-ai.netlify.app/guides/unstick-looping-replit-agent.html) - [Why Your v0 or Bolt App Fails to Deploy on Vercel (and How to Fix It)](https://fixkit-ai.netlify.app/guides/v0-bolt-vercel-deploy-failed.html) - ["Invalid API key" or Undefined Env Vars on Vercel: How to Fix It](https://fixkit-ai.netlify.app/guides/vercel-env-vars-invalid-api-key.html) ## Other - [FAQ](https://fixkit-ai.netlify.app/faq.html)