Starting mongrel rails server error...

I have a new rails installation on a Mac and am running into problems
when trying to start my mongrel server (mongrel_rails start).  The
application I'm working on was created from an older version of rails
(windows); could that be the problem?  If so, how can I resolve this?
Any help is appreciated...

** Starting Mongrel listening at 0.0.0.0:3000
** Starting Rails with development environment...
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/
active_record/connection_adapters/abstract/connection_specification.rb:
14: undefined method `cattr_accessor' for ActiveRecord::Base:Class
(NoMethodError)
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
27:in `gem_original_require'
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
27:in `require'
	from /usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/
active_record/connection_adapters/abstract_adapter.rb:10
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
27:in `gem_original_require'
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
27:in `require'
	from /Users/marksmith/src/apps/sasg3/trunk/config/db2odbc_adapter.rb:
82
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
27:in `gem_original_require'
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:
27:in `require'
	 ... 12 levels...
	from /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.4/bin/../lib/
mongrel/command.rb:212:in `run'
	from /usr/local/lib/ruby/gems/1.8/gems/mongrel-1.1.4/bin/
mongrel_rails:281
	from /usr/local/bin/mongrel_rails:19:in `load'
	from /usr/local/bin/mongrel_rails:19

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