# Parent controller is removed from the module tree

**URL:** <https://www.ruby-forum.com/t/parent-controller-is-removed-from-the-module-tree/157716>\
**Category:** Engines\
**Created:** [January 14, 2009, 6:44pm UTC](https://www.ruby-forum.com/t/parent-controller-is-removed-from-the-module-tree/157716 "2009-01-14T18:44:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Andy\_Matsubara](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/9d8465/32.png) [@Andy\_Matsubara](https://www.ruby-forum.com/u/Andy_Matsubara)\
**Post date:** [January 14, 2009, 6:44pm UTC](https://www.ruby-forum.com/t/parent-controller-is-removed-from-the-module-tree/157716/1 "2009-01-14T18:44:47Z")

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Hello,

I’m a newbie in this list. And Ive just begun using the Rails Engin  
plugin.

I’m using a plugin’s controller, which is a child class of  
“Admin::AdminController”.  
When I reload the page. Rails causes a error which says,  
“A copy of Admin::AdminController has been removed from the module  
tree but is still active!”  
How can I solve the problem?

Andy Matsubara