我是这个论坛的新手，我想问一个问题。我在我的linux（Ubuntu发行版）机器上安装了ruby-processing。我想创建艺术，但是当我尝试运行我的代码时，我收到此错误消息：
rp5运行sketch.rb
/usr/local/rvm/gems/ruby-1.9.3-p448/gems/ruby-processing-2.4.4/lib/ruby-processing/app.rb:8: /usr/local/rvm/gems/ruby-1.9.3-p448/gems/ruby-processing-2.4.4/lib/ruby-processing/app.rb:45: , unexpected ':' (SyntaxError)
mouse_pressed: :mousePressed,
^
from /usr/local/rvm/gems/ruby-1.9.3-p448/gems/ruby-processing-2.4.4/lib/ruby-processing/app.rb:8:in `require'
from /usr/local/rvm/gems/ruby-1.9.3-p448/gems/ruby-processing-2.4.4/lib/ruby-processing/runners/base.rb:8
from /usr/local/rvm/gems/ruby-1.9.3-p448/gems/ruby-processing-2.4.4/lib/ruby-processing/runners/base.rb:6:in `require'
from /usr/local/rvm/gems/ruby-1.9.3-p448/gems/ruby-processing-2.4.4/lib/ruby-processing/runners/run.rb:6
我查看了app.rb文件，但我似乎无法理解为什么会出现此错误。我非常感谢你的帮助。
亲切的问候 千斤顶