# Application failed to start

**URL:** <https://www.ruby-forum.com/t/application-failed-to-start/126521>\
**Category:** Rails\
**Created:** [January 18, 2008, 11:28pm UTC](https://www.ruby-forum.com/t/application-failed-to-start/126521 "2008-01-18T23:28:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![snantz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/c2a13f/32.png) [@snantz](https://www.ruby-forum.com/u/snantz)\
**Post date:** [January 18, 2008, 11:28pm UTC](https://www.ruby-forum.com/t/application-failed-to-start/126521/1 "2008-01-18T23:28:58Z")

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I have this encryption class that lives in the lib folder. I use it to  
encrypt and decrypt credit card numbers. On my local copy of the app on  
my machine it runs fine, but on the app that lives on the server I get  
“Application failed to start properly” whenever I hit the submit button  
to add a credit card. I imagine this is a configuration issue, but I  
don’t know how to fix it. Does anyone have any ideas? Thanks,

-S

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<div class="post-metadata">

**Author:** ![snantz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/c2a13f/32.png) [@snantz](https://www.ruby-forum.com/u/snantz)\
**Post date:** [January 19, 2008, 1:28am UTC](https://www.ruby-forum.com/t/application-failed-to-start/126521/2 "2008-01-19T01:28:17Z")

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What error is showing up in your production.log