Error custom_require.rb line 36

Hi, I've moved a project on new server with ruby 1.9.1 but now I've an error:

Error message:     cannot load such file -- test/unit/error

Exception class:     LoadError

Backtrace:     # File Line Location     0 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'     1 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'     2 /var/lib/gems/1.9.1/gems/activesupport-2.1.2/lib/active_support/dependencies.rb 510 in `block in require'     3 /var/lib/gems/1.9.1/gems/activesupport-2.1.2/lib/active_support/dependencies.rb 355 in `new_constants_in'     4 /var/lib/gems/1.9.1/gems/activesupport-2.1.2/lib/active_support/dependencies.rb 510 in `require'     5 /var/lib/gems/1.9.1/gems/activesupport-2.1.2/lib/active_support/deprecation.rb 204 in `'     6 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'     7 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'     8 /var/lib/gems/1.9.1/gems/activesupport-2.1.2/lib/active_support/dependencies.rb 510 in `block in require'     9 /var/lib/gems/1.9.1/gems/activesupport-2.1.2/lib/active_support/dependencies.rb 355 in `new_constants_in'     10 /var/lib/gems/1.9.1/gems/activesupport-2.1.2/lib/active_support/dependencies.rb 510 in `require'     11 /var/lib/gems/1.9.1/gems/activesupport-2.1.2/lib/active_support.rb 40 in `'     12 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'     13 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'     14 /home/officinesalin/salin/vendor/plugins/engines/lib/engines.rb 1 in `'     15 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'     16 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'     17 /home/officinesalin/salin/vendor/plugins/engines/boot.rb 8 in `'     18 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'     19 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'     20 /home/officinesalin/salin/config/environment.rb 13 in `'     21 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'     22 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb 36 in `require'     23 /usr/lib/ruby/vendor_ruby/phusion_passenger/classic_rails/application_spawner.rb 222 in `preload_application'     24 /usr/lib/ruby/vendor_ruby/phusion_passenger/classic_rails/application_spawner.rb 181 in `block in initialize_server'     25 /usr/lib/ruby/vendor_ruby/phusion_passenger/utils.rb 572 in `report_app_init_status'     26 /usr/lib/ruby/vendor_ruby/phusion_passenger/classic_rails/application_spawner.rb 174 in `initialize_server'     27 /usr/lib/ruby/vendor_ruby/phusion_passenger/abstract_server.rb 204 in `start_synchronously'     28 /usr/lib/ruby/vendor_ruby/phusion_passenger/abstract_server.rb 180 in `start'     29 /usr/lib/ruby/vendor_ruby/phusion_passenger/classic_rails/application_spawner.rb 149 in `start'     30 /usr/lib/ruby/vendor_ruby/phusion_passenger/spawn_manager.rb 219 in `block (2 levels) in spawn_rails_application'     31 /usr/lib/ruby/vendor_ruby/phusion_passenger/abstract_server_collection.rb 132 in `lookup_or_add'     32 /usr/lib/ruby/vendor_ruby/phusion_passenger/spawn_manager.rb 214 in `block in spawn_rails_application'     33 /usr/lib/ruby/vendor_ruby/phusion_passenger/abstract_server_collection.rb 82 in `block in synchronize'     34 prelude> 10:in `synchronize'     35 /usr/lib/ruby/vendor_ruby/phusion_passenger/abstract_server_collection.rb 79 in `synchronize'     36 /usr/lib/ruby/vendor_ruby/phusion_passenger/spawn_manager.rb 213 in `spawn_rails_application'     37 /usr/lib/ruby/vendor_ruby/phusion_passenger/spawn_manager.rb 132 in `spawn_application'     38 /usr/lib/ruby/vendor_ruby/phusion_passenger/spawn_manager.rb 275 in `handle_spawn_application'     39 /usr/lib/ruby/vendor_ruby/phusion_passenger/abstract_server.rb 357 in `server_main_loop'     40 /usr/lib/ruby/vendor_ruby/phusion_passenger/abstract_server.rb 206 in `start_synchronously'     41 /usr/share/phusion-passenger/helper-scripts/passenger-spawn-server 99 in `'