yui build error

yui uild error

INFO ~ Building entries for /sproutcore:en...
INFO ~   stylesheet.css -> tmp/build/static/sproutcore/en/fd023b819af08483bbc471
14fc5388626b7a390c/stylesheet.css
INFO ~   javascript.js -> tmp/build/static/sproutcore/en/fd023b819af08483bbc4711
4fc5388626b7a390c/javascript.js
INFO ~   javascript-packed.js -> tmp/build/static/sproutcore/en/fd023b819af08483
bbc47114fc5388626b7a390c/javascript-packed.js
INFO ~   stylesheet-packed.css -> tmp/build/static/sproutcore/en/fd023b819af0848
3bbc47114fc5388626b7a390c/stylesheet-packed.css
FATAL ~ Invalid argument - ./tmp/chance/c:
FATAL ~ BACKTRACE:
c:/Ruby192/lib/ruby/1.9.1/fileutils.rb:243:in `mkdir'
c:/Ruby192/lib/ruby/1.9.1/fileutils.rb:243:in `fu_mkdir'
c:/Ruby192/lib/ruby/1.9.1/fileutils.rb:217:in `block (2 levels) in mkdir_p'
c:/Ruby192/lib/ruby/1.9.1/fileutils.rb:215:in `reverse_each'
c:/Ruby192/lib/ruby/1.9.1/fileutils.rb:215:in `block in mkdir_p'
c:/Ruby192/lib/ruby/1.9.1/fileutils.rb:201:in `each'
c:/Ruby192/lib/ruby/1.9.1/fileutils.rb:201:in `mkdir_p'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/vendor/chance/lib/cha
nce/instance.rb:211:in `block in _preprocess'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/vendor/chance/lib/cha
nce/instance.rb:193:in `map'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/vendor/chance/lib/cha
nce/instance.rb:193:in `_preprocess'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/vendor/chance/lib/cha
nce/instance.rb:103:in `update'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/builde
rs/combine.rb:42:in `buildWithChance'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/builde
rs/combine.rb:24:in `buildWithChance'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/buildtasks/build.
rake:65:in `block (2 levels) in define!'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/buildf
ile/task.rb:239:in `call'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/buildf
ile/task.rb:239:in `block in execute'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/buildf
$
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/buildf
ile/task.rb:234:in `execute'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/buildf
ile/task.rb:191:in `invoke_with_call_chain'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/buildf
ile/task.rb:148:in `invoke'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/buildf
ile.rb:216:in `invoke'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/models
/manifest_entry.rb:339:in `build_to'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/models
/manifest_entry.rb:257:in `stage!'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/models
/manifest_entry.rb:331:in `block in build_to'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/models
/manifest_entry.rb:331:in `each'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/models
/manifest_entry.rb:331:in `build_to'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/models
/manifest_entry.rb:257:in `stage!'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/models
/manifest_entry.rb:331:in `block in build_to'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/models
/manifest_entry.rb:331:in `each'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/models
/manifest_entry.rb:331:in `build_to'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/models
/manifest_entry.rb:251:in `build!'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/tools/
build.rb:80:in `block (2 levels) in build'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/tools/
build.rb:77:in `each'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/tools/
build.rb:77:in `block in build'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/tools/
build.rb:56:in `each'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/tools/
build.rb:56:in `build'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/task.rb:22:in `run'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation.rb:118:in `i
nvoke_task'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor.rb:263:in `dispatch'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/base.rb:389:in `start'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/tools.
rb:386:in `start'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/lib/sproutcore/tools.
rb:30:in `invoke'
c:/Ruby192/lib/ruby/gems/1.9.1/gems/sproutcore-1.5.0.pre.3/bin/sc-build:16:in `<
top (required)>'
c:/Ruby192/bin/sc-build:19:in `load'
c:/Ruby192/bin/sc-build:19:in `<main>'