MediaPlayer 를 사용하여 wav 파일을 재생시키는데 뜨는 에러 메세지 입니다.

tts.synthesizeToFile(str, ttsType, destFilepath)

을 사용하여 텍스트를 TTS로 발생한 다음, 저장 시켰는데 이 파일을 재생시키려고 하니 에러가 뜹니다.

01-04 22:53:34.138: E/MediaPlayer(30385): mOnVideoSizeChangedListener is null. Failed to send MEDIA_SET_VIDEO_SIZE message.
01-04 22:53:34.138: I/MediaPlayer(30385): Don't send intent. msg.arg1 = 0, msg.arg2 = 0
01-04 22:53:34.138: E/MediaPlayer(30385): mOnPreparedListener is null. Failed to send MEDIA_PREPARED message.
01-04 22:53:34.168: D/memalloc(30385): ion: Mapped buffer base:0x53996000 size:3768320 offset:0 fd:83
01-04 22:53:34.198: D/memalloc(30385): ion: Unmapping buffer  base:0x528e3000 size:3768320
01-04 22:53:34.198: D/memalloc(30385): ion: Unmapping buffer  base:0x52c7b000 size:3768320
01-04 22:53:34.198: D/memalloc(30385): ion: Unmapping buffer  base:0x53013000 size:3768320
01-04 22:53:35.119: D/memalloc(30385): ion: Mapped buffer base:0x528e3000 size:3768320 offset:0 fd:58
01-04 22:53:35.259: D/memalloc(30385): ion: Mapped buffer base:0x52c7b000 size:3768320 offset:0 fd:62
01-04 22:53:38.562: E/MediaPlayer(30385): mOnCompletionListener is null. Failed to send MEDIA_PLAYBACK_COMPLETE message.