MissingSourceFile (no such file to load -- breakpoint):

Anyone seen this before? I did a gem update recently and may have broken
something. But I’d still like to decipher what the message below
actuallt means:

MissingSourceFile (no such file to load – breakpoint):
/usr/lib64/site_ruby/1.8/rubygems/custom_require.rb:21:in
require__' /usr/lib64/site_ruby/1.8/rubygems/custom_require.rb:21:inrequire’

/usr/lib64/ruby/gems/1.8/gems/activesupport-1.3.0/lib/active_support/dependencies.rb:136:in
require' /usr/lib64/ruby/gems/1.8/gems/rails-1.1.0/lib/dispatcher.rb:80:inprepare_breakpoint’
/usr/lib64/ruby/gems/1.8/gems/rails-1.1.0/lib/dispatcher.rb:68:in
prepare_application' /usr/lib64/ruby/gems/1.8/gems/rails-1.1.0/lib/dispatcher.rb:37:indispatch’

/usr/lib64/ruby/gems/1.8/gems/mongrel-0.3.12.4/lib/mongrel/rails.rb:66:in
process' /usr/lib64/ruby/1.8/thread.rb:135:insynchronize’

/usr/lib64/ruby/gems/1.8/gems/mongrel-0.3.12.4/lib/mongrel/rails.rb:64:in
`process’

/usr/lib64/ruby/gems/1.8/gems/mongrel-0.3.12.4/lib/mongrel.rb:425:in
`process_client’

/usr/lib64/ruby/gems/1.8/gems/mongrel-0.3.12.4/lib/mongrel.rb:424:in
`process_client’