What this error means
package.json changed — often edited by an AI builder — without its lockfile, and CI installs refuse to guess.
Why it happens
package.json lists dependencies the lockfile does not. CI uses a frozen lockfile, so it stops instead of rewriting it.
The message tools print
npm ERR! `npm ci` can only install packages when your package.json and package-lock.json or npm-shrinkwrap.json are in sync. Please update your lock file with `npm install` before continuing.How to fix it
- Run the install command locally (npm install, bun install…).
- Commit the updated lockfile together with package.json.
Check a log that shows this
Paste the failing step into the build error explainer. It matches this message, and any others in the same log, in your browser. Nothing is uploaded.