ffmpeg conversion failure

gistfile1.sh

 ffmpeg -i "A State of Trance #637.mp4" "A State of Trance #637.mp3"
ffmpeg version N-58502-g738ebb4 Copyright (c) 2000-2013 the FFmpeg developers
  built on Nov 28 2013 10:55:55 with Apple LLVM version 5.0 (clang-500.2.76) (based on LLVM 3.3svn)
  configuration: 
  libavutil      52. 55.100 / 52. 55.100
  libavcodec     55. 44.100 / 55. 44.100
  libavformat    55. 21.102 / 55. 21.102
  libavdevice    55.  5.102 / 55.  5.102
  libavfilter     3. 91.100 /  3. 91.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'A State of Trance #637.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2013-11-19 07:48:38
  Duration: 02:03:20.04, start: 0.000000, bitrate: 781 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 586 kb/s, 29.97 fps, 29.97 tbr, 60k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 191 kb/s (default)
    Metadata:
      creation_time   : 2013-11-19 07:51:36
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Output #0, mp3, to 'A State of Trance #637.mp3':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    Stream #0:0(und): Audio: none, 0 channels, 128 kb/s (default)
    Metadata:
      creation_time   : 2013-11-19 07:51:36
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Stream mapping:
  Stream #0:1 -> #0:0 (aac -> ?)
Encoder (codec none) not found for output stream #0:0