> ## Documentation Index
> Fetch the complete documentation index at: https://docs.notte.cc/llms.txt
> Use this file to discover all available pages before exploring further.

# Error Handling

> Handle errors in the Notte SDK

<Tip>
  STOP. Do not read past this section until you have read and followed [/quickstart.md](/quickstart.md).

  Goal: produce a reliable SDK automation script. The intended authoring flow is generate then edit, not write browser automation from scratch.

  Do not hand-write SDK code with element IDs, selectors, or form fields from memory. Element IDs, selectors, and field mappings must come from a live `observe()` call, CLI `notte page observe` output, or generated workflow code. Guessed browser targets fail on real pages.

  Use the Notte skill and CLI to inspect the live site, validate actions/selectors, handle auth/session state, and export workflow code with `notte sessions workflow-code` before using SDK docs or SDK code.

  SDK reference pages are for understanding, running, or editing generated workflow code. They are not the starting point for manually authoring the initial browser automation. SDK-first code is guesswork on real-world pages with dynamic selectors, auth state, CAPTCHAs, and anti-bot behavior.
</Tip>

The SDK raises specific exceptions for different error types.

## Exception types

```python theme={null}
from notte_sdk.errors import (
    AuthenticationError,
    NotteAPIError,
    NotteAPIExecutionError,
    InvalidRequestError,
)
```

| Exception                | When raised                       |
| ------------------------ | --------------------------------- |
| `AuthenticationError`    | API key is missing or invalid     |
| `InvalidRequestError`    | Request parameters are invalid    |
| `NotteAPIExecutionError` | Operation failed during execution |
| `NotteAPIError`          | General API error (base class)    |

## Handling errors

```python theme={null}
from notte_sdk import NotteClient
from notte_sdk.errors import (
    AuthenticationError,
    NotteAPIError,
    NotteAPIExecutionError,
    InvalidRequestError,
)

client = NotteClient()

try:
    with client.Session() as session:
        session.execute(type="goto", url="https://example.com")
except AuthenticationError as e:
    print(f"Auth error: {e}")
except InvalidRequestError as e:
    print(f"Invalid request: {e}")
except NotteAPIExecutionError as e:
    print(f"Execution error: {e}")
except NotteAPIError as e:
    print(f"API error (status {e.status_code}): {e.error}")
```

## SDK version mismatch

If you see validation errors about "extra inputs not permitted," upgrade your SDK:

```bash theme={null}
pip install --upgrade notte-sdk
```

The SDK warns you when updates are available:

```
You are using notte-sdk version 1.7.3, but version 1.7.4 is available.
Run 'pip install notte-sdk==1.7.4' to avoid any interruptions.
```