в OSX, приложение Rails 2.3.14 под Ruby 1.9.2, это (в модели):
img = Magick::Image::read(File.join(image_path)).first
resized = img.change_geometry("#{new_width}x>")
бомбы с этой ошибкой во второй строке:
LocalJumpError (no block given):
app/models/client_file.rb:186:in `change_geometry'
app/models/client_file.rb:186:in `resize_image'
app/controllers/siteman/files_controller.rb:65:in `resize'
<internal:prelude>:10:in `synchronize'
/Users/chuckhoffman/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
/Users/chuckhoffman/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
/Users/chuckhoffman/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'