get error with xcode beta3 :decodingFailure(FoundationModels.LanguageModelSession.GenerationError.Context

@Generable
enum Breakfast {
    case waffles
    case pancakes
    case bagels
    case eggs
}

do { let session = LanguageModelSession() let userInput = "I want something sweet." let prompt = "Pick the ideal breakfast for request: (userInput)" let response = try await session.respond(to: prompt,generating: Breakfast.self) print(response.content)

} catch let error { print(error) }

i want to test the @Generable demo but get error with below:decodingFailure(FoundationModels.LanguageModelSession.GenerationError.Context(debugDescription: "Failed to convert text into into GeneratedContent\nText: waffles", underlyingErrors: [Swift.DecodingError.dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: "The given data was not valid JSON.", underlyingError: Optional(Error Domain=NSCocoaErrorDomain Code=3840 "Unexpected character 'w' around line 1, column 1." UserInfo={NSJSONSerializationErrorIndex=0, NSDebugDescription=Unexpected character 'w' around line 1, column 1.})))]))

get error with xcode beta3 :decodingFailure(FoundationModels.LanguageModelSession.GenerationError.Context
 
 
Q