我在用:
jruby 1.7.2 (ruby-1.8.7p370)
Rails 2.0.2
jruby-jars-1.7.2
jruby-rack-1.1.13.1
rake (10.0.3, 0.8.1) Rake 10.0.3 was installed by Warbler
访问应用程序时出现以下错误:
org.jruby.rack.RackInitializationException: uninitialized constant Rack::Builder
from /usr/share/tomcat6/webapps/app/WEB-INF/gems/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:266:in `load_missing_constant'
from /usr/share/tomcat6/webapps/app/WEB-INF/gems/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:453:in `const_missing'
from null:1:in `(root)'
我该如何解决这个问题?