# Anyone know what causes this?

**URL:** <https://www.ruby-forum.com/t/anyone-know-what-causes-this/165302>\
**Category:** Rails\
**Created:** [April 11, 2009, 7:48pm UTC](https://www.ruby-forum.com/t/anyone-know-what-causes-this/165302 "2009-04-11T19:48:15Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![gavin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/439d5e/32.png) [@gavin](https://www.ruby-forum.com/u/gavin)\
**Post date:** [April 11, 2009, 7:48pm UTC](https://www.ruby-forum.com/t/anyone-know-what-causes-this/165302/1 "2009-04-11T19:48:15Z")

</div>

In my app I’ve started to get a 500 error whenever trying to post to a  
create method

/!\ FAILSAFE /!\ Sat Apr 11 18:42:28 +0100 2009  
Status: 500 Internal Server Error  
string not matched

According to the log it doesn’t even get as far as the POST

anyone know what might be causing this?

I also have nested resources in my app - when creating one of them  
they seem to work fine! ?

here’s the full trace from the log:

/!\ FAILSAFE /!\ Sat Apr 11 18:42:28 +0100 2009  
Status: 500 Internal Server Error  
string not matched  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/vendor/rack-1.0/rack/utils.rb:73:in `[]=' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/ action_controller/vendor/rack-1.0/rack/utils.rb:73:in`normalize\_params’  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/vendor/rack-1.0/rack/utils.rb:89:in  
`normalize_params' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/ action_controller/vendor/rack-1.0/rack/utils.rb:58:in`parse\_nested\_query’  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/vendor/rack-1.0/rack/utils.rb:56:in `each' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/ action_controller/vendor/rack-1.0/rack/utils.rb:56:in`parse\_nested\_query’  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/vendor/rack-1.0/rack/request.rb:132:in `POST' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/ action_controller/vendor/rack-1.0/rack/methodoverride.rb:15:in`call’  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/params\_parser.rb:15:in `call' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/ action_controller/rewindable_input.rb:25:in`call’  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/session/cookie\_store.rb:93:in `call' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/ action_controller/reloader.rb:9:in`call’  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/failsafe.rb:11:in `call' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/ action_controller/vendor/rack-1.0/rack/lock.rb:11:in`call’  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/vendor/rack-1.0/rack/lock.rb:11:in `synchronize' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/ action_controller/vendor/rack-1.0/rack/lock.rb:11:in`call’  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/dispatcher.rb:106:in `call' /Users/Gavin/.gem/ruby/1.8/gems/rails-2.3.2/lib/rails/rack/ static.rb:31:in`call’  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/vendor/rack-1.0/rack/urlmap.rb:46:in `call' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/ action_controller/vendor/rack-1.0/rack/urlmap.rb:40:in`each’  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/vendor/rack-1.0/rack/urlmap.rb:40:in `call' /Users/Gavin/.gem/ruby/1.8/gems/rails-2.3.2/lib/rails/rack/ log_tailer.rb:17:in`call’  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/vendor/rack-1.0/rack/content\_length.rb:13:in `call' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/ action_controller/vendor/rack-1.0/rack/chunked.rb:15:in`call’  
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/  
action\_controller/vendor/rack-1.0/rack/handler/mongrel.rb:61:in  
`process' /Users/Gavin/.gem/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb: 159:in`process\_client’  
/Users/Gavin/.gem/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:  
158:in `each' /Users/Gavin/.gem/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb: 158:in`process\_client’  
/Users/Gavin/.gem/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:  
285:in `run' /Users/Gavin/.gem/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb: 285:in`initialize’  
/Users/Gavin/.gem/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:  
285:in `new' /Users/Gavin/.gem/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb: 285:in`run’  
/Users/Gavin/.gem/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:  
268:in `initialize' /Users/Gavin/.gem/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb: 268:in`new’  
/Users/Gavin/.gem/ruby/1.8/gems/mongrel-1.1.5/lib/mongrel.rb:  
268:in `run' /usr/local/lib/ruby/gems/1.8/gems/actionpack-2.3.2/lib/ action_controller/vendor/rack-1.0/rack/handler/mongrel.rb:34:in`run’  
/Users/Gavin/.gem/ruby/1.8/gems/rails-2.3.2/lib/commands/server.rb:  
111  
/usr/local/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:31:in  
`gem_original_require' /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in`require’  
script/server:3

---

<div class="post-metadata">

**Author:** ![gavin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/439d5e/32.png) [@gavin](https://www.ruby-forum.com/u/gavin)\
**Post date:** [April 11, 2009, 8:27pm UTC](https://www.ruby-forum.com/t/anyone-know-what-causes-this/165302/2 "2009-04-11T20:27:30Z")

</div>

Are you using Rack? It looks like you might be experiencing this error  
(or something very similar):

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