# NovaModelNotFoundError

> **Class** in `langchain_amazon_nova`

📖 [View in docs](https://reference.langchain.com/python/langchain-amazon-nova/_exceptions/NovaModelNotFoundError)

Exception raised when model is not found or not available (HTTP 404).

This occurs when:
- Model name is invalid
- Model is not available in the region
- Model access has not been granted

## Signature

```python
NovaModelNotFoundError(
    self,
    model_name: str,
    message: Optional[str] = None,
    response: Optional[Dict[str, Any]] = None,
)
```

## Parameters

| Name | Type | Required | Description |
|------|------|----------|-------------|
| `model_name` | `str` | Yes | Name of the model that was not found |
| `message` | `Optional[str]` | No | Optional custom error message (default: `None`) |
| `response` | `Optional[Dict[str, Any]]` | No | Full response data if available (default: `None`) |

## Extends

- `NovaError`

## Constructors

```python
__init__(
    self,
    model_name: str,
    message: Optional[str] = None,
    response: Optional[Dict[str, Any]] = None,
)
```

| Name | Type |
|------|------|
| `model_name` | `str` |
| `message` | `Optional[str]` |
| `response` | `Optional[Dict[str, Any]]` |


## Properties

- `model_name`

---

[View source on GitHub](https://github.com/amazon-nova-api/langchain-amazon-nova/blob/213daad519b5c69124a9029884d7f593944bd35f/libs/amazon_nova/langchain_amazon_nova/_exceptions.py#L58)