attempting to specs.untag core/string/slice_spec.rb produces an error (regex?)

[tobarja]

athompson@cloud02:~/dev/topaz$ invoke specs.untag --untranslated --files=../rubyspec/core/string/slice_spec.rb
../mspec/bin/mspec tag --del fails -g fails -f spec  -t `pwd`/bin/topaz_untranslated.py --config=topaz.mspec ../rubyspec/core/string/slice_spec.rb
topaz (ruby-1.9.3p125) (git rev efb2871) [x86_64-linux]
 (ERROR - 1)
TagAction: no tags 'fails' were deleted


1)
An exception occurred during: loading /mnt/glusterfs/athompson/dev/rubyspec/core/string/slice_spec.rb ERROR
SyntaxError: line 16: duplicate group
/mnt/glusterfs/athompson/dev/mspec/lib/mspec/helpers/language_version.rb:23:in `require'
/mnt/glusterfs/athompson/dev/mspec/lib/mspec/helpers/language_version.rb:23:in `block in language_version'
/mnt/glusterfs/athompson/dev/topaz/lib-topaz/array.rb:66:in `each'
/mnt/glusterfs/athompson/dev/mspec/lib/mspec/helpers/language_version.rb:20:in `language_version'
/mnt/glusterfs/athompson/dev/rubyspec/core/string/shared/slice.rb:410:in `<main>'
/mnt/glusterfs/athompson/dev/rubyspec/core/string/slice_spec.rb:5:in `require'
/mnt/glusterfs/athompson/dev/rubyspec/core/string/slice_spec.rb:5:in `<main>'
/mnt/glusterfs/athompson/dev/mspec/lib/mspec/runner/mspec.rb:57:in `load'
/mnt/glusterfs/athompson/dev/mspec/lib/mspec/runner/mspec.rb:57:in `block in block in files'
/mnt/glusterfs/athompson/dev/mspec/lib/mspec/runner/mspec.rb:69:in `instance_eval'
/mnt/glusterfs/athompson/dev/mspec/lib/mspec/runner/mspec.rb:69:in `protect'
/mnt/glusterfs/athompson/dev/mspec/lib/mspec/runner/mspec.rb:57:in `block in files'
/mnt/glusterfs/athompson/dev/topaz/lib-topaz/array.rb:66:in `each'
/mnt/glusterfs/athompson/dev/mspec/lib/mspec/runner/mspec.rb:51:in `files'
/mnt/glusterfs/athompson/dev/mspec/lib/mspec/runner/mspec.rb:43:in `process'
/mnt/glusterfs/athompson/dev/mspec/lib/mspec/commands/mspec-tag.rb:129:in `run'
/mnt/glusterfs/athompson/dev/mspec/lib/mspec/utils/script.rb:218:in `main'
/mnt/glusterfs/athompson/dev/mspec/bin/mspec-tag:8:in `<main>'

Finished in 1.960609 seconds

1 file, 0 examples, 0 expectations, 0 failures, 1 error