>ArgumentError (A copy of AccessControl has been removed from the module tree 
>but is still active!):

Check your environments/development.rb for config.cache_classes and try 
setting it to true:
config.cache_classes = true #false

It worked for me. It should also help, if you're using RubyInline and 
have created some C/C++ methods in a class. In my case, I simply make a 
system call to run an external binary.

You may also want to try and put your code in a gem, as it gets loaded 
every time you start the server, and doesn't get unloaded.
-- 
Posted via http://www.ruby-forum.com/.

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