# Uninitialized constant ApplicationController::Authentication

**URL:** <https://www.ruby-forum.com/t/uninitialized-constant-applicationcontroller-authentication/195164>\
**Category:** Rails\
**Created:** [September 17, 2010, 11:51pm UTC](https://www.ruby-forum.com/t/uninitialized-constant-applicationcontroller-authentication/195164 "2010-09-17T23:51:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![paul](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/bbe5ce/32.png) [@paul](https://www.ruby-forum.com/u/paul)\
**Post date:** [September 17, 2010, 11:51pm UTC](https://www.ruby-forum.com/t/uninitialized-constant-applicationcontroller-authentication/195164/1 "2010-09-17T23:51:15Z")

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I don’t know what happen when i suite with  
[#188 Declarative Authorization - RailsCasts](http://railscasts.com/episodes/188-declarative-authorization)

the error message happen when i have typed [http://localhost:3000](http://localhost:3000)

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**Author:** ![paul](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/bbe5ce/32.png) [@paul](https://www.ruby-forum.com/u/paul)\
**Post date:** [September 18, 2010, 3:37am UTC](https://www.ruby-forum.com/t/uninitialized-constant-applicationcontroller-authentication/195164/2 "2010-09-18T03:37:44Z")

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wow , at least show the errors

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<div class="post-metadata">

**Author:** ![paul](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/bbe5ce/32.png) [@paul](https://www.ruby-forum.com/u/paul)\
**Post date:** [September 18, 2010, 7:03am UTC](https://www.ruby-forum.com/t/uninitialized-constant-applicationcontroller-authentication/195164/3 "2010-09-18T07:03:44Z")

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Wat error u see…just say the error here.