Gem location problem from rake task

I have installed the following gem which is in my environment.rb.
However when I try to run a rake task, it gives the error:

environment.rb
config.gem “devise_invitable”, :version => ‘0.2.3’

$ rake mytasks:task
(in /home/allen/www/lines)
DEPRECATION WARNING: Rake tasks in vendor/plugins/paperclip/tasks are
deprecated. Use lib/tasks instead. (called from
/usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/tasks/rails.rb:10)
Missing these required gems:
devise_invitable = 0.2.3

You’re running:
ruby 1.8.7.249 at /usr/bin/ruby1.8
rubygems 1.3.5 at /home/allen/.gem/ruby/1.8, /usr/lib/ruby/gems/1.8

Run rake gems:install to install the missing gems.

so I do “rake gems:install” and it installs.

$ gem env
RubyGems Environment:

  • RUBYGEMS VERSION: 1.3.7
  • RUBY VERSION: 1.8.7 (2010-04-19 patchlevel 253) [x86_64-linux]
  • INSTALLATION DIRECTORY: /usr/local/lib/ruby/gems/1.8
  • RUBY EXECUTABLE: /usr/local/bin/ruby
  • EXECUTABLE DIRECTORY: /usr/local/bin
  • RUBYGEMS PLATFORMS:
    • ruby
    • x86_64-linux
  • GEM PATHS:
    • /usr/local/lib/ruby/gems/1.8
    • /home/allen/.gem/ruby/1.8
  • GEM CONFIGURATION:
    • :update_sources => true
    • :verbose => true
    • :benchmark => false
    • :backtrace => false
    • :bulk_threshold => 1000
  • REMOTE SOURCES:

In the directory:
$ cd /usr/local/lib/ruby/gems/1.8/gems/
[email protected]:/usr/local/lib/ruby/gems/1.8/gems$ ll
total 132
.
.
drwxr-xr-x 6 root root 4096 2010-08-20 13:50 devise_invitable-0.2.3

HELP!

BTW when I do “gem list” the gem appears:

gem list

[email protected]:~/www/lines$ gem list

*** LOCAL GEMS ***

actionmailer (2.3.8)
actionpack (2.3.8)
activerecord (2.3.8)
activeresource (2.3.8)
activesupport (2.3.8)
authlogic (2.1.3)
bcrypt-ruby (2.1.2)
crack (0.1.6)
devise (1.0.8, 1.0.7)
devise_invitable (0.2.3) <-----------------
fastthread (1.0.7)
formtastic (0.9.10)

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