Ricty生成時のエラー

Ricty生成時に以下のエラーが出るのですが、原因がわかりません。原因がわかる方教えていただけないでしょうか？

$ sudo bash -x ~/Ricty/ricty_generator.sh -v auto
+ ricty_version=4.0.1
+ ricty_familyname=Ricty
+ ricty_familyname_suffix=
+ ricty_ascent=835
+ ricty_descent=215
+ fontforge_command=fontforge
+ redirection_stderr=/dev/null
+ fonts_directories='. /Users/ippo/.fonts /usr/local/share/fonts /usr/share/fonts /Users/ippo/Library/Fonts /Library/Fonts /c/Windows/Fonts /cygdrive/c/Windows/Fonts'
+ zenkaku_space_glyph=
+ leaving_tmp_flag=false
+ fullwidth_ambiguous_flag=true
+ scaling_down_flag=true
+ modified_inconsolata_generator=modified_inconsolata_generator.pe
+ modified_inconsolata_regular=Modified-Inconsolata-Regular.sfd
+ modified_inconsolata_bold=Modified-Inconsolata-Bold.sfd
+ modified_migu1m_generator=modified_migu1m_generator.pe
+ modified_migu1m_regular=Modified-migu-1m-regular.sfd
+ modified_migu1m_bold=Modified-migu-1m-bold.sfd
+ ricty_generator=ricty_generator.pe
+ cat
Ricty Generator 4.0.1

Copyright (c) 2011-2015, Yasunori Yusa <yascentur at gmail.com>
All rights reserved.

This script is to generate ``Ricty'' font from Inconsolata and Migu 1M.
It requires 2-5 minutes to generate Ricty. Owing to SIL Open Font License
Version 1.1 section 5, it is PROHIBITED to distribute the generated font.

+ getopts hVf:vln:wWbBZ:zas OPT
+ case "$OPT" in
+ echo 'Option: Enable verbose mode'
Option: Enable verbose mode
+ redirection_stderr=/dev/stderr
+ getopts hVf:vln:wWbBZ:zas OPT
++ expr 2 - 1
+ shift 1
+ which fontforge
+ '[' 1 -eq 1 -a auto = auto ']'
+ tmp=
+ for i in '$fonts_directories'
+ '[' -d . ']'
+ tmp=' .'
+ for i in '$fonts_directories'
+ '[' -d /Users/ippo/.fonts ']'
+ for i in '$fonts_directories'
+ '[' -d /usr/local/share/fonts ']'
+ for i in '$fonts_directories'
+ '[' -d /usr/share/fonts ']'
+ for i in '$fonts_directories'
+ '[' -d /Users/ippo/Library/Fonts ']'
+ tmp=' . /Users/ippo/Library/Fonts'
+ for i in '$fonts_directories'
+ '[' -d /Library/Fonts ']'
+ tmp=' . /Users/ippo/Library/Fonts /Library/Fonts'
+ for i in '$fonts_directories'
+ '[' -d /c/Windows/Fonts ']'
+ for i in '$fonts_directories'
+ '[' -d /cygdrive/c/Windows/Fonts ']'
+ fonts_directories=' . /Users/ippo/Library/Fonts /Library/Fonts'
++ find . /Users/ippo/Library/Fonts /Library/Fonts -follow -name Inconsolata-Regular.ttf
++ head -n 1
+ input_inconsolata_regular=/Users/ippo/Library/Fonts/Inconsolata-Regular.ttf
++ find . /Users/ippo/Library/Fonts /Library/Fonts -follow -name Inconsolata-Bold.ttf
++ head -n 1
+ input_inconsolata_bold=/Users/ippo/Library/Fonts/Inconsolata-Bold.ttf
+ '[' -z /Users/ippo/Library/Fonts/Inconsolata-Regular.ttf -o -z /Users/ippo/Library/Fonts/Inconsolata-Bold.ttf ']'
++ find . /Users/ippo/Library/Fonts /Library/Fonts -follow -iname migu-1m-regular.ttf
++ head -n 1
+ input_migu1m_regular=/Users/ippo/Library/Fonts/migu-1m-regular.ttf
++ find . /Users/ippo/Library/Fonts /Library/Fonts -follow -iname migu-1m-bold.ttf
++ head -n 1
+ input_migu1m_bold=/Users/ippo/Library/Fonts/migu-1m-bold.ttf
+ '[' -z /Users/ippo/Library/Fonts/migu-1m-regular.ttf -o -z /Users/ippo/Library/Fonts/migu-1m-bold.ttf ']'
+ '[' -w /tmp -a false = false ']'
++ mktemp -d /tmp/ricty_generator_tmpdir.XXXXXX
+ tmpdir=/tmp/ricty_generator_tmpdir.sRxkz5
+ '[' false = false ']'
+ trap 'if [ -d "/tmp/ricty_generator_tmpdir.sRxkz5" ]; then echo '\''Remove temporary files.'\''; rm -rf /tmp/ricty_generator_tmpdir.sRxkz5; echo '\''Abnormally terminated.'\''; fi; exit 3' HUP INT QUIT
+ trap 'if [ -d "/tmp/ricty_generator_tmpdir.sRxkz5" ]; then echo '\''Remove temporary files.'\''; rm -rf /tmp/ricty_generator_tmpdir.sRxkz5; echo '\''Abnormally terminated.'\''; fi' EXIT
+ cat
+ cat
+ cat
+ fontforge -script /tmp/ricty_generator_tmpdir.sRxkz5/modified_inconsolata_generator.pe
Copyright (c) 2000-2014 by George Williams. See AUTHORS for Contributors.
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
 with many parts BSD <http://fontforge.org/license.html>. Please read LICENSE.
 Based on sources from 10:51 PDT 13-Sep-2015-D.
 Based on source from git with hash:
Generate modified Inconsolata.
Open /Users/ippo/Library/Fonts/Inconsolata-Regular.ttf.
The following table(s) in the font have been ignored by FontForge
  Ignoring 'LTSH' linear threshold table
  Ignoring 'VDMX' vertical device metrics table
The glyph named visiblespace is mapped to U+2423.
But its name indicates it should be mapped to U+2420.
Remove ambiguous glyphs.
Process for merging.
Save Modified-Inconsolata-Regular.sfd.
Open /Users/ippo/Library/Fonts/Inconsolata-Bold.ttf.
The glyph named visiblespace is mapped to U+2423.
But its name indicates it should be mapped to U+2420.
Remove ambiguous glyphs.
Process for merging.
Save Modified-Inconsolata-Bold.sfd.
+ fontforge -script /tmp/ricty_generator_tmpdir.sRxkz5/modified_migu1m_generator.pe
Copyright (c) 2000-2014 by George Williams. See AUTHORS for Contributors.
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
 with many parts BSD <http://fontforge.org/license.html>. Please read LICENSE.
 Based on sources from 10:51 PDT 13-Sep-2015-D.
 Based on source from git with hash:
Generate modified Migu 1M.
Open /Users/ippo/Library/Fonts/migu-1m-regular.ttf.
Scale down all glyphs (it may takes a little time).
Process for merging.
Save Modified-migu-1m-regular.sfd.
Open /Users/ippo/Library/Fonts/migu-1m-bold.ttf.
Scale down all glyphs (it may takes a little time).
Process for merging.
Save Modified-migu-1m-bold.sfd.
+ fontforge -script /tmp/ricty_generator_tmpdir.sRxkz5/ricty_generator.pe
Copyright (c) 2000-2014 by George Williams. See AUTHORS for Contributors.
 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
 with many parts BSD <http://fontforge.org/license.html>. Please read LICENSE.
 Based on sources from 10:51 PDT 13-Sep-2015-D.
 Based on source from git with hash:
Generate Ricty.
Merge Modified-Inconsolata-Regular.sfd with Modified-migu-1m-regular.sfd.
Edit zenkaku space.
Edit zenkaku comma and period.
Edit zenkaku colon and semicolon.
Edit zenkaku brackets.
Edit en and em dashes.
Process before saving (it may takes a little time).
Save Ricty-Regular.ttf.
保存に失敗しました.
Generate: Save failed
Called from...
/tmp/ricty_generator_tmpdir.sRxkz5/ricty_generator.pe: 140 行目
+ exit 4
+ '[' -d /tmp/ricty_generator_tmpdir.sRxkz5 ']'
+ echo 'Remove temporary files.'
Remove temporary files.
+ rm -rf /tmp/ricty_generator_tmpdir.sRxkz5
+ echo 'Abnormally terminated.'
Abnormally terminated.