# ActionController::InvalidAuthenticityToken

**URL:** <https://www.ruby-forum.com/t/actioncontroller-invalidauthenticitytoken/134873>\
**Category:** Rails\
**Created:** [April 15, 2008, 9:18pm UTC](https://www.ruby-forum.com/t/actioncontroller-invalidauthenticitytoken/134873 "2008-04-15T21:18:53Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mikhailov](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/59ef9b/32.png) [@mikhailov](https://www.ruby-forum.com/u/mikhailov)\
**Post date:** [April 15, 2008, 9:18pm UTC](https://www.ruby-forum.com/t/actioncontroller-invalidauthenticitytoken/134873/1 "2008-04-15T21:18:53Z")

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I have fixed this problem by include prototype in template  
\<%= javascript\_include\_tag “prototype” %\>