# Mongrel issue dev vs. prod

**URL:** <https://www.ruby-forum.com/t/mongrel-issue-dev-vs-prod/188003>\
**Category:** Rails\
**Created:** [May 4, 2010, 12:27am UTC](https://www.ruby-forum.com/t/mongrel-issue-dev-vs-prod/188003 "2010-05-04T00:27:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![bigdaddy71](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bbe5ce/32.png) [@bigdaddy71](https://www.ruby-forum.com/u/bigdaddy71)\
**Post date:** [May 4, 2010, 12:27am UTC](https://www.ruby-forum.com/t/mongrel-issue-dev-vs-prod/188003/1 "2010-05-04T00:27:26Z")

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I can start this app in dev mode fine but it blows up when I do -e  
production. Here is what I get from the brief output in the cli: No  
idea what is going on and why it would do that in prod mode.

F:/BACKUP/Backup/ruby/lib/ruby/1.8/erb.rb:441:in `scan': undefined method`empty?’ for nil:NilClass (NoMethodError)  
from F:/BACKUP/Backup/ruby/lib/ruby/1.8/erb.rb:497:in  
`compile' from F:/BACKUP/Backup/ruby/lib/ruby/1.8/erb.rb:664:in`initialize’  
from F:/BACKUP/Backup/ruby/lib/ruby/gems/1.8/gems/  
actionpack-2.2.2/lib/action\_view/template\_handlers/erb.rb:51:in `new' from F:/BACKUP/Backup/ruby/lib/ruby/gems/1.8/gems/ actionpack-2.2.2/lib/action_view/template_handlers/erb.rb:51:in`compile’  
from F:/BACKUP/Backup/ruby/lib/ruby/gems/1.8/gems/  
actionpack-2.2.2/lib/action\_view/template\_handler.rb:11:in `call' from F:/BACKUP/Backup/ruby/lib/ruby/gems/1.8/gems/ actionpack-2.2.2/lib/action_view/renderable.rb:21:in`\_unmemoized\_compiled\_source’  
from F:/BACKUP/Backup/ruby/lib/ruby/gems/1.8/gems/  
activesupport-2.2.2/lib/active\_support/memoizable.rb:57:in  
`compiled_source' from F:/BACKUP/Backup/ruby/lib/ruby/gems/1.8/gems/ activesupport-2.2.2/lib/active_support/memoizable.rb:25:in` **send** ’  
… 29 levels…  
from F:/BACKUP/Backup/ruby/lib/ruby/gems/1.8/gems/rails-2.2.2/  
lib/commands/server.rb:49  
from F:/BACKUP/Backup/ruby/lib/ruby/site\_ruby/1.8/rubygems/  
custom\_require.rb:31:in `gem_original_require' from F:/BACKUP/Backup/ruby/lib/ruby/site_ruby/1.8/rubygems/ custom_require.rb:31:in`require’  
from script/server:3

---

<div class="post-metadata">

**Author:** ![bigdaddy71](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bbe5ce/32.png) [@bigdaddy71](https://www.ruby-forum.com/u/bigdaddy71)\
**Post date:** [May 4, 2010, 10:34am UTC](https://www.ruby-forum.com/t/mongrel-issue-dev-vs-prod/188003/2 "2010-05-04T10:34:53Z")

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On May 3, 11:25 pm, Me [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> I can start this app in dev mode fine but it blows up when I do -e  
> production. Here is what I get from the brief output in the cli: No  
> idea what is going on and why it would do that in prod mode.

The main difference between production mode and development mode that  
seems relevant here is that rails will go and load up all your classes  
and templates and so on ahead of time, so if you had a class or  
template which a syntax error or similar in it that you never actually  
used then you’d never hit it in development but production would still  
choke on it.

Fred