events.js:72
throw er; // Unhandled 'error' event
^
Error in plugin 'gulp-hologram'
/Library/Ruby/Gems/2.0.0/gems/rouge-1.9.1/lib/rouge/lexers/shell.rb:20: warning: already initialized constant Rouge::Lexers::Shell::KEYWORDS
/Library/Ruby/Gems/2.0.0/gems/rouge-1.9.1/lib/rouge/lexers/shell.rb:20: warning: previous definition of KEYWORDS was here
/Library/Ruby/Gems/2.0.0/gems/rouge-1.9.1/lib/rouge/lexers/shell.rb:25: warning: already initialized constant Rouge::Lexers::Shell::BUILTINS
/Library/Ruby/Gems/2.0.0/gems/rouge-1.9.1/lib/rouge/lexers/shell.rb:25: warning: previous definition of BUILTINS was here
at Socket.<anonymous> (/Users/....../....../node_modules/gulp-hologram/index.js:96:30)
at Socket.emit (events.js:117:20)
at _stream_readable.js:943:16
at process._tickCallback (node.js:419:13)
when i used the "rouge 1.9.1", an error occured.