# XO1511: an embed.Dir has no file at this literal path

An `embed.Dir`'s keys are the files' paths relative to the directory of the file that declares the constant, so `const SITE: embed.Dir = embed("static")` holds `static/index.html`, not `index.html`, and `SITE.read("index.html")` gives None: a server that serves the result shows a blank page. When one key ends with the path, the warning offers it as a fix and notes that `SITE.sub("static")` drops the prefix. A path computed at run time is not checked, and the call is not an error because its result is an Option.

## Example

```xo
const SITE: embed.Dir = embed("static")

fn page() -> Bytes { SITE.read("index.html") ?? b"" }
```

## Fix

```xo
const SITE: embed.Dir = embed("static")

fn page() -> Bytes { SITE.read("static/index.html") ?? b"" }
```

Run `xo explain XO1511` for this text in a terminal, or see
[section 10.6 of the specification](../../spec/core/#106-diagnostic-codes).