title: mbrola voice throws ProcessException "No audio data read" on linux CentOS
body: <p>I am using mbrola voice (us1) on CentOS. I am trying to save the audio as wav file. But at the line (in bold below) - voice.speak(), it throws an exception ProcessException  "No audio data read".  It works fine when I run it on windows environment or even works on Linux with Kevin16 voice . Tried googling why voice.speak() command behaves this way for mbrola voices but could not find anything. Below is code, any clue ?</p>
  
  <pre><code>public static void createAudioFile(String text, String fileName) {
      AudioPlayer audioPlayer = null;
  
      System.setProperty("mbrola.base", Constants.mbrolaDiskPath);
      Voice voice;
      VoiceManager vm =  VoiceManager.getInstance();
      voice = vm.getVoice("mbrola_us1");
      //voice = vm.getVoice("kevin16");
      voice.allocate();
  
      try{
          String directoryPath = audioDir+fileName;
          audioPlayer = new SingleFileAudioPlayer(directoryPath,Type.WAVE);
          voice.setAudioPlayer(audioPlayer);
          **voice.speak(text);**
          voice.deallocate();
          audioPlayer.close();
  
      }
      catch(Exception e){
          e.printStackTrace();
      }
  
  }
  </code></pre>