# X_BUILD_OUT_UNSAFE

## Means

the static export directory is not one a build may empty

## Typical cause

every static build empties its export directory first, and this one is the app root, an ancestor of it, or an existing non-empty directory that carries no `.x-export` marker a previous build wrote (the default `.x/static` is exempt) — `--out apps`, `--out .x` (the dev database), a home directory. Nothing is removed

## Fix

`x build --target static --out .x/static --json`

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