# PerplexityResponsesStreamError

> **Class** in `langchain_perplexity`

📖 [View in docs](https://reference.langchain.com/python/langchain-perplexity/chat_models/PerplexityResponsesStreamError)

Raised when a Perplexity Responses (Agent) API stream fails mid-flight.

Carries the structured error fields the API surfaces (`code`, `type`,
`param`, `request_id`) and the original event payload so observability
pipelines can inspect them programmatically instead of regex-parsing the
message string.

## Signature

```python
PerplexityResponsesStreamError(
    self,
    message: str,
    *,
    code: str | None = None,
    error_type: str | None = None,
    param: str | None = None,
    request_id: str | None = None,
    raw_event: Any = None,
)
```

## Extends

- `RuntimeError`

## Constructors

```python
__init__(
    self,
    message: str,
    *,
    code: str | None = None,
    error_type: str | None = None,
    param: str | None = None,
    request_id: str | None = None,
    raw_event: Any = None,
) -> None
```

| Name | Type |
|------|------|
| `message` | `str` |
| `code` | `str \| None` |
| `error_type` | `str \| None` |
| `param` | `str \| None` |
| `request_id` | `str \| None` |
| `raw_event` | `Any` |


## Properties

- `code`
- `error_type`
- `param`
- `request_id`
- `raw_event`

---

[View source on GitHub](https://github.com/langchain-ai/langchain/blob/879cad06769913c8329d72e700263537ff436053/libs/partners/perplexity/langchain_perplexity/chat_models.py#L454)