ffmpeg No such filter woes

/opt/local/bin/ffmpeg -i one.flv -i two.flv -i one.jpg -i two.jpg -filter_complex "
    [0:0] pad='max(240\,iw):max(180\,ih):0:0', scale='240:180', pad='480:180:0:0' [left_video];
    [1:0] pad='max(240\,iw):max(180\,ih):0:0', scale='240:180', pad='480:180:240:0' [right_video];
    [left_video] [right_video] overlay [videos];

    [2:0] pad='max(240\,iw):max(180\,ih):0:0:0x00000000', scale='240:180', pad='480:180:0:0' [left_avatar];
    [3:0] pad='max(240\,iw):max(180\,ih):0:0:0x00000000', scale='240:180', pad='480:180:240:0' [right_avatar];
    [left_avatar] [right_avatar] overlay [avatars];

    [avatars] [videos] overlay [video];

    [0:1] [1:1] amerge;
    " -acodec libfaac -ac 2 -vcodec libx264 -r 15 out.mp4



ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on May 28 2013 16:00:50 with Apple clang version 3.1 (tags/Apple/clang-318.0.61) (based on LLVM 3.1svn)
  configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid --enable-nonfree --enable-libfaac
  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
Splitting the commandline.
Reading option '-v' ... matched as option 'v' (set libav* logging level) with argument 'debug'.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option '-i' ... matched as input file with argument 'stream1.flv'.
Reading option '-i' ... matched as input file with argument 'stream2.flv'.
Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument '
    [0:0] pad='max(240\,iw):max(180\,ih):0:0:0x00000000', scale='240:180', pad='480:180:0:0' [left_video];
    [1:0] pad='max(240\,iw):max(180\,ih):0:0:0x00000000', scale='240:180', pad='480:180:240:0' [right_video];
    [left_video] [right_video] overlay [videos];

    [2:0] pad='max(240\,iw):max(180\,ih):0:0:0x00000000', scale='240:180', pad='480:180:0:0' [left_avatar];
    [3:0] pad='max(240\,iw):max(180\,ih):0:0:0x00000000', scale='240:180', pad='480:180:240:0' [right_avatar];
    [left_avatar] [right_avatar] overlay [avatars];

    [avatars] [videos] overlay [video];

    [0:1] [1:1] amerge;
    '.
Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'libfaac'.
Reading option '-ac' ... matched as option 'ac' (set number of audio channels) with argument '2'.
Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'libx264'.
Reading option '-r' ... matched as option 'r' (set frame rate (Hz value, fraction or abbreviation)) with argument '15'.
Reading option 'out.mp4' ... matched as output file.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option v (set libav* logging level) with argument debug.
Applying option y (overwrite output files) with argument 1.
Applying option filter_complex (create a complex filtergraph) with argument
    [0:0] pad='max(240\,iw):max(180\,ih):0:0:0x00000000', scale='240:180', pad='480:180:0:0' [left_video];
    [1:0] pad='max(240\,iw):max(180\,ih):0:0:0x00000000', scale='240:180', pad='480:180:240:0' [right_video];
    [left_video] [right_video] overlay [videos];

    [2:0] pad='max(240\,iw):max(180\,ih):0:0:0x00000000', scale='240:180', pad='480:180:0:0' [left_avatar];
    [3:0] pad='max(240\,iw):max(180\,ih):0:0:0x00000000', scale='240:180', pad='480:180:240:0' [right_avatar];
    [left_avatar] [right_avatar] overlay [avatars];

    [avatars] [videos] overlay [video];

    [0:1] [1:1] amerge;
    .
Successfully parsed a group of options.
Parsing a group of options: input file stream1.flv.
Successfully parsed a group of options.
Opening an input file: stream1.flv.
[flv @ 0x7fb1cb03d800] Format flv probed with size=2048 and score=100
[flv @ 0x7fb1cb03d800] File position before avformat_find_stream_info() is 13
[flv @ 0x7fb1cb03d800] All info found
rfps: 59.666667 0.014879
rfps: 59.750000 0.012147
rfps: 59.833333 0.011554
rfps: 59.916667 0.013100
rfps: 60.000000 0.016784
rfps: 59.940060 0.013918
[flv @ 0x7fb1cb03d800] File position after avformat_find_stream_info() is 49666
Input #0, flv, from 'stream1.flv':
  Metadata:
    creationdate    : Tue Jun 4 12:40:11
  Duration: 00:00:07.71, start: 0.002000, bitrate: 361 kb/s
    Stream #0:0, 41, 1/1000: Video: flv1, yuv420p, 240x180, 1/1000, 1k tbr, 1k tbn, 1k tbc
    Stream #0:1, 34, 1/1000: Audio: nellymoser, 11025 Hz, mono, flt
Successfully opened the file.
Parsing a group of options: input file stream2.flv.
Successfully parsed a group of options.
Opening an input file: stream2.flv.
[flv @ 0x7fb1cb040200] Format flv probed with size=2048 and score=100
[flv @ 0x7fb1cb040200] File position before avformat_find_stream_info() is 13
[flv @ 0x7fb1cb040200] All info found
rfps: 59.666667 0.016928
rfps: 59.750000 0.012545
rfps: 59.833333 0.010320
rfps: 59.916667 0.010255
rfps: 59.940060 0.010624
[flv @ 0x7fb1cb040200] File position after avformat_find_stream_info() is 50872
Input #1, flv, from 'stream2.flv':
  Metadata:
    creationdate    : Tue Jun 4 12:40:11
  Duration: 00:00:07.82, start: 0.018000, bitrate: 358 kb/s
    Stream #1:0, 41, 1/1000: Video: flv1, yuv420p, 240x180, 1/1000, 1k tbr, 1k tbn, 1k tbc
    Stream #1:1, 34, 1/1000: Audio: nellymoser, 11025 Hz, mono, flt
Successfully opened the file.
Parsing a group of options: output file out.mp4.
Applying option acodec (force audio codec ('copy' to copy stream)) with argument libfaac.
Applying option ac (set number of audio channels) with argument 2.
Applying option vcodec (force video codec ('copy' to copy stream)) with argument libx264.
Applying option r (set frame rate (Hz value, fraction or abbreviation)) with argument 15.
Successfully parsed a group of options.
Opening an output file: out.mp4.
[pad @ 0x7fb1cac1a9a0] Setting 'width' to value 'max(240,iw)'
[pad @ 0x7fb1cac1a9a0] Setting 'height' to value 'max(180,ih)'
[pad @ 0x7fb1cac1a9a0] Setting 'x' to value '0'
[pad @ 0x7fb1cac1a9a0] Setting 'y' to value '0'
[pad @ 0x7fb1cac1a9a0] Setting 'color' to value '0x00000000'
[scale @ 0x7fb1cac1b5e0] Setting 'w' to value '240'
[scale @ 0x7fb1cac1b5e0] Setting 'h' to value '180'
[Parsed_scale_1 @ 0x7fb1cac1b580] w:240 h:180 flags:'' interl:0
[pad @ 0x7fb1cac1ba20] Setting 'width' to value '480'
[pad @ 0x7fb1cac1ba20] Setting 'height' to value '180'
[pad @ 0x7fb1cac1ba20] Setting 'x' to value '0'
[pad @ 0x7fb1cac1ba20] Setting 'y' to value '0'
[pad @ 0x7fb1cac1b860] Setting 'width' to value 'max(240,iw)'
[pad @ 0x7fb1cac1b860] Setting 'height' to value 'max(180,ih)'
[pad @ 0x7fb1cac1b860] Setting 'x' to value '0'
[pad @ 0x7fb1cac1b860] Setting 'y' to value '0'
[pad @ 0x7fb1cac1b860] Setting 'color' to value '0x00000000'
[scale @ 0x7fb1cac24540] Setting 'w' to value '240'
[scale @ 0x7fb1cac24540] Setting 'h' to value '180'
[Parsed_scale_4 @ 0x7fb1cac244e0] w:240 h:180 flags:'' interl:0
[pad @ 0x7fb1cac248a0] Setting 'width' to value '480'
[pad @ 0x7fb1cac248a0] Setting 'height' to value '180'
[pad @ 0x7fb1cac248a0] Setting 'x' to value '240'
[pad @ 0x7fb1cac248a0] Setting 'y' to value '0'
[pad @ 0x7fb1cac2cfa0] Setting 'width' to value 'max(240,iw)'
[pad @ 0x7fb1cac2cfa0] Setting 'height' to value 'max(180,ih)'
[pad @ 0x7fb1cac2cfa0] Setting 'x' to value '0'
[pad @ 0x7fb1cac2cfa0] Setting 'y' to value '0'
[pad @ 0x7fb1cac2cfa0] Setting 'color' to value '0x00000000'
[scale @ 0x7fb1cac2d200] Setting 'w' to value '240'
[scale @ 0x7fb1cac2d200] Setting 'h' to value '180'
[Parsed_scale_8 @ 0x7fb1cac2d180] w:240 h:180 flags:'' interl:0
[pad @ 0x7fb1cac2d4e0] Setting 'width' to value '480'
[pad @ 0x7fb1cac2d4e0] Setting 'height' to value '180'
[pad @ 0x7fb1cac2d4e0] Setting 'x' to value '0'
[pad @ 0x7fb1cac2d4e0] Setting 'y' to value '0'
[pad @ 0x7fb1cac2da60] Setting 'width' to value 'max(240,iw)'
[pad @ 0x7fb1cac2da60] Setting 'height' to value 'max(180,ih)'
[pad @ 0x7fb1cac2da60] Setting 'x' to value '0'
[pad @ 0x7fb1cac2da60] Setting 'y' to value '0'
[pad @ 0x7fb1cac2da60] Setting 'color' to value '0x00000000'
[scale @ 0x7fb1cac2dcc0] Setting 'w' to value '240'
[scale @ 0x7fb1cac2dcc0] Setting 'h' to value '180'
[Parsed_scale_11 @ 0x7fb1cac2dc40] w:240 h:180 flags:'' interl:0
[pad @ 0x7fb1cac2e000] Setting 'width' to value '480'
[pad @ 0x7fb1cac2e000] Setting 'height' to value '180'
[pad @ 0x7fb1cac2e000] Setting 'x' to value '240'
[pad @ 0x7fb1cac2e000] Setting 'y' to value '0'
[AVFilterGraph @ 0x7fb1cac2c1a0] No such filter: ''
Error configuring filters.
Statistics: 65536 bytes read, 0 seeks
[AVIOContext @ 0x7fb1cac194c0] Statistics: 65536 bytes read, 0 seeks