I was getting this error with Rails 2.2 when using ActionMailer.
NoMethodError (undefined method `finder’ for #<ActionView::Base:0x34146fc>)
It stems from a line in engines/lib/engines/rails_extensions/action_mailer.rb
This is some problem between Rails 2.2 and Engines. Reinstalling engines didn’t seem to help.
Simply put, you need to go here and apply this patch:
This took me hours to figure out. I don’t know why there isn’t any more help on this problem.