我最近安装了' ar-extension '宝石.安装后我运行rails c或rails s时出现以下错误:
/usr/local/rvm/gems/ruby-1.9.2-p320/gems/ar-extensions-0.9.2/lib/ar-extensions/extensions.rb:427:in `<class:SqliteRegexp>': undefined method `class_inheritable_accessor' for ActiveRecord::Extensions::SqliteRegexp:Class (NoMethodError)
from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/ar-extensions-0.9.2/lib/ar-extensions/extensions.rb:426:in `<module:Extensions>'
from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/ar-extensions-0.9.2/lib/ar-extensions/extensions.rb:112:in `<top (required)>'
from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:251:in `require'
from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:251:in `block in require'
from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:236:in `load_dependency'
from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:251:in `require'
from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/ar-extensions-0.9.2/init.rb:10:in `<top (required)>'
from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:251:in `require'
from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:251:in `block in require'
from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:236:in `load_dependency'
from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:251:in `require'
from /usr/local/rvm/gems/ruby-1.9.2-p320/gems/ar-extensions-0.9.2/lib/ar-extensions.rb:5:in `<top (required)>'
from /usr/local/rvm/gems/ruby-1.9.2-p320@global/gems/bundler-1.1.4/lib/bundler/runtime.rb:68:in `require'
from /usr/local/rvm/gems/ruby-1.9.2-p320@global/gems/bundler-1.1.4/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
from /usr/local/rvm/gems/ruby-1.9.2-p320@global/gems/bundler-1.1.4/lib/bundler/runtime.rb:66:in `each'
from /usr/local/rvm/gems/ruby-1.9.2-p320@global/gems/bundler-1.1.4/lib/bundler/runtime.rb:66:in `block in require'
from /usr/local/rvm/gems/ruby-1.9.2-p320@global/gems/bundler-1.1.4/lib/bundler/runtime.rb:55:in …