ERR-291/stack trace

ERR-291

Windsurf app deployment failing — fix build and deploy errors

Windsurf app deployment failing — fix build and deploy errors

Last updated 17 April 2026 · 7 min read · By Hyder Shah

Emergency triage — $299 Free diagnostic

Direct answer

Windsurf generates code in your local IDE but has no deployment tooling. Deploy failures come from: environment variables not set in the deploy platform, TypeScript errors that only surface at build time, incorrect build commands, or Cascade-generated code with implicit dependencies not installed in CI. Four steps diagnose and fix 90% of Windsurf deploy failures.

Quick fix for Windsurf app deployment failing — fix

Start here

Fix 1 — Set environment variables in deploy platform

Copy every variable from your .env.localto your deployment platform’s environment variables settings. Vercel: Project → Settings → Environment Variables. Railway: Variables tab. Common miss: NEXT_PUBLIC_ prefix for client-side vars. Without the prefix, the variable is server-only; with the prefix, it is inlined into the client bundle.

Deeper fixes when the quick fix fails

02
Fix 2 — Run the production build locally first
Before deploying:
```
npm run build
```
This runs the same build step as your CI/CD. Fix any TypeScript or build errors that surface. Then:
```
npm run start
```
Test the production build on localhost:3000. Anything that fails here will fail on Vercel/Railway too — catch it before CI burns.
03
Fix 3 — Check Cascade-generated imports
Windsurf Cascade sometimes imports packages that aren’t in package.json(it assumes they’re installed). Run:
```
npm install
```
after any Cascade session and check for “Package not found” warnings. Push the updated package.json and package-lock.json.
04
Fix 4 — Review build logs line by line
Vercel and Railway both show build logs. Read them from the first error, not the last. The first error is usually the root cause; everything after is cascade failures. Common first error: missing env var, which causes a null reference in the next line, which causes a build abort.

Prevent the next failure

Add a predeploy script to package.json that runs npm run build locally before pushing, and commit package-lock.jsonevery time. Set “Fail on type errors” in your CI so TypeScript problems surface on every push, not just on deploy.

Why AI-built apps hit Windsurf app deployment failing — fix

Windsurf modifies local code. Your local environment has all the right env vars, the right Node version, the right installed packages. CI/CD environments start from scratch — none of that is inherited.

Cascade can also import packages without updating package.json, rely on type-check skipping that dev mode does but production builds don’t, or write Node-specific code that breaks in edge runtime.

“Windsurf built everything perfectly. Now I can't get it deployed anywhere.”

Windsurf Discord

Diagnose Windsurf app deployment failing — fix by failure mode

Read the build logs first. Match the first error to the fix — everything after the first error is usually a cascade failure from that one root cause.

Symptom	Cause	Fix
Build fails: 'process.env.X is undefined'	Env var not set in deploy platform	Fix 1
Build fails: TypeScript errors not seen locally	Dev mode skips type check, build doesn't	Fix 2
Build fails: 'Module not found'	Cascade imported package without updating package.json	Fix 3
Multiple errors cascading, no obvious root cause	First error triggering downstream failures	Fix 4

Related errors we fix

Still stuck with Windsurf app deployment failing — fix?

Emergency triage · $299 · 48h turnaround

We restore service and write the root-cause report.

If you’ve been staring at red build logs for hours, we’ll get it deployed today:

→Your Windsurf app won't deploy to Vercel or Railway
→Build logs are full of errors you don't understand
→Env vars worked locally but something's missing in production
→You have a launch deadline and need this live today

start the triage →

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When you've tried 20 things and nothing works

Windsurf app deployment failing — fix questions

Why does my Windsurf app build locally but fail on Vercel?+

Three common reasons: (1) env vars in .env.local weren't copied to Vercel's environment variables, (2) dev mode (npm run dev) skips the type-check that build (npm run build) enforces, or (3) Cascade imported a package that isn't in package.json. Running 'npm run build' locally reproduces the CI environment and surfaces all three.

What's the difference between .env.local and Vercel env vars?+

.env.local is a local file, gitignored, only read on your machine. Vercel's environment variables are stored on their platform and injected at build and runtime. They do not sync automatically — you have to paste each variable manually. Vercel also separates vars by environment (Production, Preview, Development).

Why does NEXT_PUBLIC_ matter?+

Environment variables prefixed with NEXT_PUBLIC_ are inlined into the client JavaScript bundle at build time. Variables without the prefix are server-only and never sent to the browser. If your client code reads process.env.API_URL and it's undefined in production, you either need NEXT_PUBLIC_API_URL (safe to expose) or you should move the read to a server component / API route.

How do I know what packages Cascade added?+

Run 'npm install' — if package.json is missing any imported package, npm warns. Alternatively, run 'npm ls' or grep your imports against package.json dependencies. Cascade is good at adding the import statement but sometimes forgets to run npm install behind the scenes.

My build logs have 50 errors. Where do I start?+

Only the first error. Every subsequent error is almost always a cascade from the root cause. In a Vercel build log, scroll to the first line with 'Error:' or 'Failed to compile' — that's your target. Fix that one, push, watch the rest disappear.

How much does a deploy fix cost?+

A single deploy unblock runs $299 as Emergency Triage (48-hour turnaround) — env vars set, build fixed, deploy verified on production URL. For a hardened setup with preview environments, monitoring, custom domain, and CI gates, our Deployment & Launch package starts at $1,999.

Next step

Ship the fix. Keep the fix.

Emergency Triage restores service in 48 hours. Break the Fix Loop rebuilds CI so this error cannot ship again.

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About the author

Hyder Shah leads Afterbuild Labs, shipping production rescues for apps built in Lovable, Bolt.new, Cursor, Replit, v0, and Base44. our rescue methodology.

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