Lovable App Not Working? Common Errors, Fixed

Top Error Patterns

• Build fails after generated changes or dependency updates.
• Deploy fails due to environment/config drift.
• GitHub push/merge conflicts with generated changes.
• Runtime errors that pass generation but fail in production-like environments.

Fast Triage Checklist

• Lock Node/runtime version and reinstall dependencies cleanly.
• Verify required env vars and secrets are present for build and runtime.
• Run lint, typecheck, and tests before deploy.
• Split large generated change sets into smaller commits.
• Check framework-specific config changes (routing, build target, SSR/static output).

Fix by Symptom

1. Build Error After Generation

Usually caused by dependency mismatch, invalid imports, or stale lockfiles. Reinstall dependencies, pin versions, then rerun build with strict logs.

2. Deployment Error but Local Works

Check hosting target differences (SSR vs static), environment variables, and output directory config. Most failures are environment parity issues.

3. GitHub Push Rejected

Sync with remote first, resolve conflicts on small chunks, and avoid force-pushing generated mega-commits.

Common Error Messages

• Module not found: A generated import references a file that was renamed or removed in a later change. Check the import path and verify the target file exists.
• ENOSPC: no space left on device: Build artefacts or node_modules exceeded the hosting environment disk quota. Clean build cache and remove unused dependencies.
• TypeError: Cannot read properties of undefined: Generated code references a variable or prop that is not initialised. Add null checks or verify the component receives the expected data.
• ERR_MODULE_NOT_FOUND on deploy: Local Node version differs from the hosting environment. Lock the Node version in .nvmrc or engines field in package.json.

When to Stop Patching and Move to Feature1

• You are repeatedly fixing generation regressions.
• Features require structured planning and acceptance criteria.
• You need AC-by-AC implementation, PR traceability, and release notes.

At that point, move the repo into a production delivery workflow: Feature1 platform workflow.

Related Guides

• Export a Lovable project to GitHub
• Replit to GitHub + Feature1 migration hub
• Feature1 platform features

Verification

Verified on April 4, 2026. Source reference: Lovable Docs (Git Integration). Error examples here are generalized patterns and should be validated against your exact stack and logs.

Frequently asked questions

Why does my Lovable app build fail after generation?

It is usually a dependency mismatch, an invalid import or a stale lockfile. Reinstall dependencies cleanly, pin versions and rerun the build with strict logs. If you see Module not found, a generated import points at a file that was renamed or removed in a later change. Check the import path and confirm the file exists.

Why does my Lovable app work locally but fail on deploy?

Most of these failures are environment parity issues. Check hosting target differences such as SSR versus static, environment variables and output directory config. If you get ERR_MODULE_NOT_FOUND on deploy, your local Node version differs from the hosting environment. Lock it in .nvmrc or the engines field in package.json.

When should I stop patching Lovable errors?

Stop when you are fixing generation regressions again and again, when features need structured planning and acceptance criteria, or when you need AC-by-AC implementation, PR traceability and release notes. At that point, move the repo into a production delivery workflow such as Feature1.

More export guides

• Export a Lovable project to GitHub
• Export a Replit project to GitHub
• Export a Bolt project to GitHub
• Export a Base44 project to GitHub
• Export an Emergent project to GitHub
• All export guides in one place