# Don't know how to build task 'db:migrate:engines'

**URL:** <https://www.ruby-forum.com/t/dont-know-how-to-build-task-dbengines/114038>\
**Category:** Engines\
**Created:** [September 7, 2007, 9:09am UTC](https://www.ruby-forum.com/t/dont-know-how-to-build-task-dbengines/114038 "2007-09-07T09:09:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Randy\_Francisco](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/c5a1d2/32.png) [@Randy\_Francisco](https://www.ruby-forum.com/u/Randy_Francisco)\
**Post date:** [September 7, 2007, 9:09am UTC](https://www.ruby-forum.com/t/dont-know-how-to-build-task-dbengines/114038/1 "2007-09-07T09:09:07Z")

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Hi Peeps

I tried running this command "rake engine\_migrate” and it gives me this  
error (rake aborted! Don’t know how to build task ‘db:migrate:engines’  
). Base on what I have read in this mailing list it has something to do  
with the version of the rails. I tried executing this command rake  
db:migrate:engines ENGINE=help it still gives me the same error. I donÂ’t  
know what to do it is my first time using this engines. I follow every  
instruction posted in the engine and helpengine readme file. Kinda new  
here in using this stuff and in Ruby on rails as well I really need your  
help . Btw, I am using rails 1.2.3 and engine 1.2.0

Cheers  
Krypton

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<div class="post-metadata">

**Author:** ![Randy\_Francisco](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/c5a1d2/32.png) [@Randy\_Francisco](https://www.ruby-forum.com/u/Randy_Francisco)\
**Post date:** [September 7, 2007, 9:24am UTC](https://www.ruby-forum.com/t/dont-know-how-to-build-task-dbengines/114038/2 "2007-09-07T09:24:08Z")

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Hi,

You probably need to read the README files within the engines plugin -  
migration behaviour changed considerably with the 1.2.0 release.

James