Ruby on Rails

I started getting this error message when I attempt to do some rake
tasks:

$ rails destroy scaffold genotypes
/usr/share/rails-ruby1.8/railties/lib/rails_generator/options.rb:32:in
`default_options': undefined method `write_inheritable_attribute' for
Rails::Generator::Base:Class (NoMethodError)
from
/usr/share/rails-ruby1.8/railties/lib/rails_generator/base.rb:90:in
`<class:Base>'
from
/usr/share/rails-ruby1.8/railties/lib/rails_generator/base.rb:85:in
`<module:Generator>'
from
/usr/share/rails-ruby1.8/railties/lib/rails_generator/base.rb:48:in
`<module:Rails>'
from
/usr/share/rails-ruby1.8/railties/lib/rails_generator/base.rb:6:in `<top
(required)>'
from
/home/caseyr/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
from
/home/caseyr/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
from /usr/share/rails-ruby1.8/railties/lib/rails_generator.rb:34:in
`<top (required)>'
from
/home/caseyr/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
from
/home/caseyr/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require'
from /usr/share/rails-ruby1.8/railties/bin/rails:14:in `<main>'
$


I found a related old message here that seemed to indicate my problem
might be caused because I did not install gems as root, so here is what
my gem environment looks like:

$ gem environment
RubyGems Environment:
- RUBYGEMS VERSION: 1.8.21
- RUBY VERSION: 1.8.7 (2010-08-16 patchlevel 302) [i486-linux]
- INSTALLATION DIRECTORY: /home/caseyr/.rvm/gems/ruby-1.9.3-p194
- RUBY EXECUTABLE: /usr/bin/ruby1.8
- EXECUTABLE DIRECTORY: /home/caseyr/.rvm/gems/ruby-1.9.3-p194/bin
- RUBYGEMS PLATFORMS:
- ruby
- x86-linux
- GEM PATHS:
- /home/caseyr/.rvm/gems/ruby-1.9.3-p194
- /home/caseyr/.rvm/gems/ruby-1.9.3-p194@global
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :benchmark => false
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- http://rubygems.org/

Can anyone tell if this is incorrect? Do I need to uninstall and
reinstall gems?

Any suggestions much appreciated...

--rick

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