Transcribing audio and creating VTT captions file...
Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.util.List.stream()" because "segments" is null
at deitel.openai.OpenAIUtilities.speechToVTT(OpenAIUtilities.java:239)
at SpeechToVTTDemo.main(SpeechToVTTDemo.java:23)