# `BB.Error.Kinematics.UnknownJoint`
[🔗](https://github.com/beam-bots/bb/blob/main/lib/bb/error/kinematics/unknown_joint.ex#L5)

Joint not found in robot topology.

Returned when a lookup names a joint the robot does not have.

# `t`

```elixir
@type t() :: %BB.Error.Kinematics.UnknownJoint{
  __exception__: term(),
  bread_crumbs: term(),
  class: term(),
  joint: atom(),
  path: term(),
  robot: atom() | nil,
  splode: term(),
  stacktrace: term(),
  vars: term()
}
```

# `exception`

```elixir
@spec exception(opts :: Keyword.t()) :: %BB.Error.Kinematics.UnknownJoint{
  __exception__: term(),
  bread_crumbs: term(),
  class: term(),
  joint: term(),
  path: term(),
  robot: term(),
  splode: term(),
  stacktrace: term(),
  vars: term()
}
```

Create an `Elixir.BB.Error.Kinematics.UnknownJoint` without raising it.

## Keys

- :joint
- :robot

---

*Consult [api-reference.md](api-reference.md) for complete listing*