Amazon Bedrock Workshop - [Bug] model identifier invalid

[PRACHI2610]

While running the amazon.titan-image-generator-v2 code throws error saying.
ValidationException: An error occurred (ValidationException) when calling the InvokeModel operation: The provided model identifier is invalid.

Code:
response = boto3_bedrock.invoke_model(
body=body,
modelId="amazon.titan-image-generator-v2:0",
accept="application/json",
contentType="application/json"