我在尝试运行的协作项目中遇到了 pdf-writer gem 的问题，我正在使用RVM, Ruby 1.9.2p180, Rails 3.1.0 on Ubuntu 10.10.
我创建了一个新的gemset使用 Bundler 安装所需的 gem，但是当我尝试运行该应用程序时，出现以下错误；
josethernandezc@DG965WH:~/Desktop/conest31$ rails s
/home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:240:in `require': /home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/pdf-writer-1.1.8/lib/pdf/writer.rb:712: invalid multibyte char (US-ASCII) (SyntaxError)
/home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/pdf-writer-1.1.8/lib/pdf/writer.rb:712: invalid multibyte char (US-ASCII)
/home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/pdf-writer-1.1.8/lib/pdf/writer.rb:712: syntax error, unexpected $end, expecting keyword_end
content = "%PDF-#{@version}\n%âãÏÓ\n"
^
from /home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:240:in `block in require'
from /home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:223:in `block in load_dependency'
from /home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:640:in `new_constants_in'
from /home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:223:in `load_dependency'
from /home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/activesupport-3.1.0/lib/active_support/dependencies.rb:240:in `require'
from /home/josethernandezc/Desktop/conest31/config/application.rb:58:in `<top (required)>'
from /home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/railties-3.1.0/lib/rails/commands.rb:52:in `require'
from /home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/railties-3.1.0/lib/rails/commands.rb:52:in `block in <top (required)>'
from /home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/railties-3.1.0/lib/rails/commands.rb:49:in `tap'
from /home/josethernandezc/.rvm/gems/ruby-1.9.2-p180@conest31/gems/railties-3.1.0/lib/rails/commands.rb:49:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
问题在于pdf-writer-1.1.8/lib/pdf/writer.rb:712，特别是；content = "%PDF-#{@version}\n%âãÏÓ\n"
任何建议都会很棒，我尝试用谷歌搜索错误，但我没有找到任何特定于 pdf-writer 的内容......
pdf-writer与 Ruby 1.9 不兼容。有一个叉子是：https://github.com/metakills/pdf-writer https://github.com/metaskills/pdf-writer
改变pdf-writerGemfile 中的行：
gem 'pdf-writer', :git => 'git://github.com/metaskills/pdf-writer.git'
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