How to fix build error E403

I keep getting this during install. Any ideas

This is almost always one of two things:

1. Your CI/CD runner doesn't have permission to write to the target directory (check if it runs as a non-root user). If you recently switched from npm install to pnpm, this can happen because pnpm uses hard links and expects specific filesystem permissions. Try running with --allow-same-file=false as a test.

2. The build script is trying to write into a read-only volume or a protected directory like /usr/local/bin. Check your scripts section in package.json — if you're calling something like chmod +x ./build/app and the ./build dir was created by root, it will fail with E403.

Quick debug: add ls -la build/ before the failing command to see who owns the target directory.

You should probably start by reading the issue description that's already linked in your own post — it literally says what the error is and which build step failed. The E403 variant was addressed in PR #1295, so check whether you're on a version prior to

That fixed it for me too. Thanks!

This is almost always a permissions issue with your build cache directory. The compiler can see the source files but cannot write to its own output folder because it's owned by another user (likely from running sudo npm install or similar).

Fix: find and re-own everything in your project root.

find . -type d -exec chmod 755 {} +
find . -type f -exec chmod 644 {} +
chown --recursive $(whoami) .

If that doesn't work, wipe the build artifacts entirely: rm -rf build/ node_modules/.cache/* and rebuild from scratch. The E403 is rarely a code error — it's the filesystem saying "I can see what you want to do but I won't let you write the result."

I had this issue last week. Update your .env file and run npm install --force —

I had this same issue last week. The solution was just updating my environment variables and restarting the