knife-ec2 + databag_dump_load breaks

rake log

When I have https://gist.github.com/368740 put in tasks/databag_dump_load.rake AND I use a knife.rb that includes knife[:aws_*] = 'foo' ala http://rubydoc.info/gems/knife-ec2/0.5.6/file/README.rdoc I get errors.

It's interesting that I'm even running rake with --trace and I don't get a stacktrace...

rake --trace
(in /chef-repo)
ERROR: You have an error in your config file /chef-repo/.chef/knife.rb
NoMethodError: undefined method `[]=' for #<Chef::Knife:0x110e7e8>
  /home/chris/clients/fanestra/aws/chef-repo/.chef/knife.rb:16:in `from_file'
  /home/chris/clients/fanestra/aws/chef-repo/.chef/knife.rb:16:in `from_file'

     # /chef-repo/.chef/knife.rb
 15: aws_secretfile         = "#{current_dir}/aws_secret_access_key"
 16: knife[:aws_ssh_key_id] = 'foo'
 17: knife[:aws_access_key_id] = 'bar'

ERROR: You have an error in your config file /chef-repo/.chef/knife.rb
SystemExit: exit
  /chef-repo/.chef/knife.rb:16:in `from_file'

     # /home/chris/clients/fanestra/aws/chef-repo/.chef/knife.rb
 15: aws_secretfile         = "#{current_dir}/aws_secret_access_key"
 16: knife[:aws_ssh_key_id] = 'fanestra20110517'
 17: knife[:aws_access_key_id] = 'bar'