# Error: NameError (uninitialized constant Mysql)

**URL:** <https://www.ruby-forum.com/t/error-nameerror-uninitialized-constant-mysql/99674>\
**Category:** Rails\
**Created:** [July 24, 2006, 9:09pm UTC](https://www.ruby-forum.com/t/error-nameerror-uninitialized-constant-mysql/99674 "2006-07-24T21:09:10Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rajesh\_GS](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/5e9695/32.png) [@Rajesh\_GS](https://www.ruby-forum.com/u/Rajesh_GS)\
**Post date:** [July 24, 2006, 9:09pm UTC](https://www.ruby-forum.com/t/error-nameerror-uninitialized-constant-mysql/99674/1 "2006-07-24T21:09:10Z")

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Hi

I am getting this error on my localhost in a project I started work on.  
It was working properly until sometime back. I am not what broke this  
because I had to do some copy paste from some other project to make it  
deploy on site5.

NameError (uninitialized constant Mysql):  
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/dependencies.rb:123:in  
`const_missing' d:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:133:in`send’  
d:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active\_support/dependencies.rb:133:in  
`const_missing' d:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active_record/connection_adapters/mysql_adapter.rb:34:in`mysql\_connection’  
d:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.3/lib/active\_record/connection\_adapters/abstract/connection\_specification.rb:251:in  
`send’…  
…  
…

I have installed rails in the app/vendor folder. I am getting this  
problem on my localhost only. After deploy its working fine. I am tired  
looking at this errror all day.

thanks in advance

Rajesh