# Get this error: "A copy of \* has been removed from the module tree but is still active!" **URL:** \ **Category:** Rails\ **Created:** [August 28, 2009, 8:55pm UTC](https://www.ruby-forum.com/t/get-this-error-a-copy-of-has-been-removed-from-the-module-tree-but-is-still-active/174567 "2009-08-28T20:55:35Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [August 28, 2009, 8:55pm UTC](https://www.ruby-forum.com/t/get-this-error-a-copy-of-has-been-removed-from-the-module-tree-but-is-still-active/174567/1 "2009-08-28T20:55:35Z")
Hi, In one of my javascript functions I do two consecutive GET (ajax) requests in quick succession. I get the following error in Rails version 2.3.3 but not in 2.3.2. If I give a time lag (even 500ms) between to two requests the problem vanishes!!: * * * ArgumentError ``` in StudentsController#index ``` ``` A copy of StudentsController has been removed from the module tree but is still active! ``` Sometimes I also get ‘A copy of AuthenticatedSystem has been removed from the module tree but is still active!’ error. Someone else has also been having a similar problem (http:// [railsforum.com/viewtopic.php?id=33976](http://railsforum.com/viewtopic.php?id=33976)) The application trace is: ``` 
/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/

```

active\_support/dependencies.rb:414:in `load_missing_constant' /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.3/lib/active_support/ dependencies.rb:96:in `const\_missing’  
/home/~/app/controllers/students\_controller.rb:4:in `index’\

```