uninitialized constant Rails::Initializer::Engines

I'm getting this stack trace from ./dispatch.fcgi:

/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:477:in `const_missing': uninitialized constant Rails::Initializer::Engines (NameError)
from ../config/../vendor/plugins/datetime_toolbocks/init.rb:23:in `load_plugin'
from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:401:in `load_plugin'
from /usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/core_ext/kernel/reporting.rb:11:in `silence_warnings'
from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:401:in `load_plugin'
from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:185:in `load_plugins'
from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:185:in `each'
from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:185:in `load_plugins'
from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:105:in `process'
from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:43:in `send'
from /usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:43:in `run'
from ./../config/environment.rb:14
from ./dispatch.fcgi:21:in `require'
from ./dispatch.fcgi:21

Anyone know what this is about? Thanks.

It looks like you need to install the engines plugin. The author of the datetime_toolbocks plugin should be able to advise you of the correct version to use.