# SH0005: The JSON Pointer names no value in the scene's data

Source: https://zafnok.github.io/shuyi-engine/learn/errors/sh0005/

Class: usage, exit code 2.

`scene --path <pointer>` (MCP's session `scene` with `path`) reads one
value of the scene's data by JSON Pointer (RFC 6901): `/hero/x` is the
key `x` of the key `hero`, `/units/3` the fourth item of `units`, and
`/outcome/Won/turn` the `turn` of an `outcome` that is `Won`. The
pointer named a key the data doesn't have, an item past the end of a
list, or went into a number or a string; or it was no pointer at all
(one is empty, or starts with `/`). The message names the pointer and
the keys of the deepest object it reached.

A key the game's data holds only some of the time is missing then:
`/outcome/Won` names nothing while the stage is still played (its
`outcome` is `null`), or after it was lost.

**How to fix it.** Pass a pointer to one of the keys the message lists.
`scene --json` shows the whole data, and `scene --shape` its JSON Schema:
every key it may hold. A `/` or a `~` in a key is written `~1` or `~0`.

For example:

```text
scene: error[SH0005]: no value at `/hero/z`: /hero has the keys x, y
```