[JS] error with imagen-image-generation flow in basic-gemini sample

UNKNOWN: Error fetching from https://generativelanguage.googleapis.com/v1beta/models/imagen-3.0-generate-002:predict: [404 Not Found] models/imagen-3.0-generate-002 is not found for API version v1beta, or is not supported for predict. Call ListModels to see the list of available models and their supported methods.