A copy of ApplicationController has been removed from the module tree but is still active!

[horaceho]

Got the error as title.

It seems the only fix from Google is to change:

config.cache_classes = false

to:

config.cache_classes = true

in config/environments/development.rb

the "unloadable" fix suggested by others does not work for me.

the error is hit at line 11 of the following code:

10:

<%= link_to 'Home', root_path %>

11: <% if current_user %>
12:

<%= link_to 'ID: ' + current_user.login, edit_user_path(current_user) %>

13:

IP:<%=h current_user.current_login_ip %>

14:

<%= link_to 'Logout', logout_path %>

it seems that there is something wrong with the current_user method (defined application_controller.rb as suggested by Ryan's Railscasts ( http://asciicasts.com/episodes/160-authlogic )

thanks

[horaceho]

the detail error: http://pastie.org/855261

[springbok]

hi,

I'm not sure if this is a smerf problem, it sounds like you have issues with authlogic. SMERF only requires you to set the ID of your user's record for example
self.smerf_user_id = current_user.id how you do that is up to your application.

[jcoyne]

To fix this, add 'unloadable' to all the Smerf models and controllers. See http://strd6.com/2009/04/cant-dup-nilclass-maybe-try-unloadable/