# X_BUILD_FAILED

## Means

`x build` failed

## Typical cause

a static check or the bundler. For a browser entry the framework builds, the cause names which: an island file, the `sync worker` or the `page boot`

## Fix

read `cause`; the failing step is named. For a framework script: `bun build --target browser --format iife <entry>`

[CLI and verify](/error-codes#cli-and-verify)