[rails g css3buttons] command throwing an error, gem ver. 0.9.5, rails 3.05

[ac74394]

Just installed the gem using bundle install. Now trying to run the generator and here is the error output...running 'rails g css3buttons' (help is greatly appreciated!):

/usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/core_ext/file_binary_read.rb:5:in initialize': Permission denied - /usr/local/lib/ruby/gems/1.8/gems/css3buttons-0.9.5/lib/generators/css3buttons/templates/public/images/gh-icons.png (Errno::EACCES) from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/core_ext/file_binary_read.rb:5:inopen' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/core_ext/file_binary_read.rb:5:in binread' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/actions/file_manipulation.rb:27:incopy_file' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/actions/create_file.rb:54:in call' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/actions/create_file.rb:54:inrender' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/actions/create_file.rb:47:in identical?' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/actions/create_file.rb:73:inon_conflict_behavior' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/actions/empty_directory.rb:111:in invoke_with_conflict_check' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/actions/create_file.rb:61:ininvoke!' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/actions.rb:95:in action' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/actions/create_file.rb:26:increate_file' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/actions/file_manipulation.rb:26:in copy_file' from /usr/local/lib/ruby/gems/1.8/gems/css3buttons-0.9.5/lib/generators/css3buttons/css3buttons_generator.rb:6:incopy_stylesheets_and_images' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/task.rb:22:in send' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/task.rb:22:inrun' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/invocation.rb:118:in invoke_task' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/invocation.rb:124:ininvoke_all' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/shell.rb:14:in map' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/core_ext/ordered_hash.rb:73:ineach' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/invocation.rb:124:in map' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/invocation.rb:124:ininvoke_all' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/group.rb:226:in dispatch' from /usr/local/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/base.rb:389:instart' from /usr/local/lib/ruby/gems/1.8/gems/railties-3.0.5/lib/rails/generators.rb:163:in invoke' from /usr/local/lib/ruby/gems/1.8/gems/railties-3.0.5/lib/rails/commands/generate.rb:10 from /usr/local/lib/ruby/gems/1.8/gems/activesupport-3.0.5/lib/active_support/dependencies.rb:239:inrequire' from /usr/local/lib/ruby/gems/1.8/gems/activesupport-3.0.5/lib/active_support/dependencies.rb:239:in require' from /usr/local/lib/ruby/gems/1.8/gems/activesupport-3.0.5/lib/active_support/dependencies.rb:225:inload_dependency' from /usr/local/lib/ruby/gems/1.8/gems/activesupport-3.0.5/lib/active_support/dependencies.rb:596:in new_constants_in' from /usr/local/lib/ruby/gems/1.8/gems/activesupport-3.0.5/lib/active_support/dependencies.rb:225:inload_dependency' from /usr/local/lib/ruby/gems/1.8/gems/activesupport-3.0.5/lib/active_support/dependencies.rb:239:in require' from /usr/local/lib/ruby/gems/1.8/gems/railties-3.0.5/lib/rails/commands.rb:17 from script/rails:6:inrequire' from script/rails:6