gem_package and rvm do not like one another

gistfile1.sh

[2012-11-11T23:11:03-08:00] INFO: Processing gem_package[plist] action install (pivotal_workstation::default_editor line 7)
[2012-11-11T23:11:11-08:00] INFO: Processing ruby_block[Set the default editor] action create (pivotal_workstation::default_editor line 10)

================================================================================
Error executing action `create` on resource 'ruby_block[Set the default editor]'
================================================================================

LoadError
---------
cannot load such file -- plist

Cookbook Trace:
---------------
/Users/mkocher/cookbooks/pivotal_workstation/recipes/default_editor.rb:14:in `require'
/Users/mkocher/cookbooks/pivotal_workstation/recipes/default_editor.rb:14:in `block (2 levels) in from_file'

Resource Declaration:
---------------------
# In /Users/mkocher/cookbooks/pivotal_workstation/recipes/default_editor.rb

 10: ruby_block "Set the default editor" do
 11:   block do
 12:     Gem.clear_paths
 13:     require 'rubygems'
 14:     require 'plist'
 15:     `plutil -convert xml1 #{plist_file}`
 16:     ls_handler_plist = Plist::parse_xml(plist_file)
 17:     new_ls_handlers = [
 18:       { "LSHandlerContentType" => "public.plain-text",
 19:         "LSHandlerRoleAll" => ls_handler_role_all
 20:       },
 21:       { "LSHandlerContentType" => "public.ruby-script",
 22:         "LSHandlerRoleAll" => ls_handler_role_all
 23:       },
 24:       { "LSHandlerContentType" => "org.vim.yaml-file",
 25:         "LSHandlerRoleAll" => ls_handler_role_all
 26:       },
 27:       { "LSHandlerContentType" => "public.xml",
 28:         "LSHandlerRoleAll" => ls_handler_role_all
 29:       }
 30:     ]
 31:     # I go through the old_ls_handlers and remove all
 32:     # the ones that we're going to replace.
 33:     new_ls_handlers.each do |new_hash|
 34:       new_hash.each do |new_key,new_value|
 35:         if new_key == "LSHandlerContentType"
 36:           ls_handler_plist["LSHandlers"].each do |old_hash|
 37:             old_hash.each do |old_key,old_value|
 38:               if new_value == old_value and new_key == old_key
 39:                 ls_handler_plist["LSHandlers"].delete(old_hash)
 40:               end
 41:             end
 42:           end
 43:         end
 44:       end
 45:     end
 46:     ls_handler_plist["LSHandlers"] = ls_handler_plist["LSHandlers"] + new_ls_handlers

Compiled Resource:
------------------
# Declared in /Users/mkocher/cookbooks/pivotal_workstation/recipes/default_editor.rb:10:in `from_file'

ruby_block("Set the default editor") do
  action "create"
  retries 0
  retry_delay 2
  block_name "Set the default editor"
  cookbook_name :pivotal_workstation
  recipe_name "default_editor"
  block #<Proc:0x007fda28e8a580@/Users/mkocher/cookbooks/pivotal_workstation/recipes/default_editor.rb:11>
end

[2012-11-11T23:11:11-08:00] ERROR: Running exception handlers
[2012-11-11T23:11:11-08:00] ERROR: Exception handlers complete
[2012-11-11T23:11:11-08:00] FATAL: Stacktrace dumped to /var/chef/cache/chef-stacktrace.out
[2012-11-11T23:11:11-08:00] FATAL: LoadError: ruby_block[Set the default editor] (pivotal_workstation::default_editor line 10) had an error: LoadError: cannot load such file -- plist