[BUG]: Mistral does not working

[fsatsuki]

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Describe the bug

A clear and concise description of what the bug is.

Mistral with bedrock ConverseStream does'nt work.

[Cloud Watch Logs]

{
    "schemaType": "ModelInvocationLog",
    "schemaVersion": "1.0",
    "timestamp": "2024-11-25T04:34:01Z",
    "accountId": "241231359358",
    "identity": {
        "arn": "arn:aws:sts::241231359358:assumed-role/BedrockChatStack-WebSocketHandlerRole4D6EDDA6-ZlWJRBDYLEUo/BedrockChatStack-WebSocketHandler7115E6CA-tvD32M5nnzNp"
    },
    "region": "us-east-1",
    "requestId": "84c8f065-8358-4eee-9ca3-4c99b067753d",
    "operation": "ConverseStream",
    "modelId": "mistral.mistral-large-2402-v1:0",
    "errorCode": "ValidationException"
}

To Reproduce

Steps to reproduce the behavior:

1. enable enableMistral in cdk.json
2. deploy cdk
3. select model with mistral
4. say hello in chat.

Screenshots

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Additional context

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