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

# IncompatibleClient

> Raised when the Python client version is incompatible with the Fiddler platform version.

Raised when the Python client version is incompatible with the Fiddler platform version.

This exception occurs during connection initialization when the client library
version is not compatible with the connected Fiddler platform version. This
ensures that users are aware of version mismatches that could cause unexpected
behavior or missing functionality.

The exception includes both the client version and server version in the error
message to help users understand what versions are involved in the incompatibility.

## Examples

Handling version incompatibility:

```python theme={null}
try:
    fdl.init(url="https://old-fiddler.com", token="token")

except IncompatibleClient as e:
    print(f"Version mismatch: {e.message}")
    # Upgrade client or contact administrator
```

Typical error message format:

```python theme={null}
"Python Client version (3.8.0) is not compatible with your
Fiddler Platform version (3.5.0)."
```

## message