noflo.github.io
                                
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                        OptionParser::InvalidOption: invalid option: --sourcemap
i try this both on branch gh-pages and kickstarter and face the same problem after running npm install and then grunt dev.
Running "connect:dev" (connect) task
Started connect web server on localhost:4000.
Running "sass:src" (sass) task
OptionParser::InvalidOption: invalid option: --sourcemap
  Use --trace for backtrace.
Warning:  Use --force to continue.
Aborted due to warnings.
I have the same problem. Do you find any solution ?
sure, i run this on my terminal
export LANGUAGE=en_US.UTF-8
export LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8
and it works for me. i think is encoding problem on ruby