# Rails 2.3.2 won't start with "can't modify frozen class/module"

**URL:** <https://www.ruby-forum.com/t/rails-2-3-2-wont-start-with-cant-modify-frozen-class-module/163028>\
**Category:** Rails\
**Created:** [March 16, 2009, 8:49pm UTC](https://www.ruby-forum.com/t/rails-2-3-2-wont-start-with-cant-modify-frozen-class-module/163028 "2009-03-16T20:49:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![fjan](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/6de8d8/32.png) [@fjan](https://www.ruby-forum.com/u/fjan)\
**Post date:** [March 16, 2009, 8:49pm UTC](https://www.ruby-forum.com/t/rails-2-3-2-wont-start-with-cant-modify-frozen-class-module/163028/1 "2009-03-16T20:49:16Z")

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Hi all.

Rails 2.3.2 won’t start for me. It says “can’t modify frozen class/  
module”, on this statement in my environment.rb:

config.action\_view.erb\_trim\_mode = “-%”.

Anybody have any ideas? Did I hit a bug?