[chef] How to use a override attribute in environments

[David Montgomery < >]

Hi

In my development environment I would like to use the below

name "development"
description "The development environment"
default['chef_client']['handler']['graphite']['host'] = "monitor.dev.test.com"


 knife environment from file /home/ubuntu/workspace/feed-chef/chef-repo/environments/development.rb
ERROR: knife encountered an unexpected error
This may be a bug in the 'environment from file' knife command or plugin
Please collect the output of this command with the `-VV` option before filing a bug report.
Exception: NameError: undefined local variable or method `default' for development:Chef::Environment

In the cookbook attribute file:
default['chef_client']['handler']['graphite']['host'] = "monitor.dev.test.com"

So..what is the proper format to override the the environment?

Thanks