我正在尝试在Redmine中安装一个插件，名为Mylyn。但是我遇到了以下错误：
uninitialized constant RAILS_DEFAULT_LOGGER
0 /home/redmine/plugins/redmine-plugin/init.rb 3
1 /home/redmine/lib/redmine/plugin.rb 129 in `load'
2 /home/redmine/lib/redmine/plugin.rb 120 in `each'
3 /home/redmine/lib/redmine/plugin.rb 120 in `load'
4 /home/redmine/config/initializers/30-redmine.rb 13
5 /usr/lib64/ruby/gems/1.8/gems/railties-3.2.6/lib/rails/engine.rb 588
6 /usr/lib64/ruby/gems/1.8/gems/railties-3.2.6/lib/rails/engine.rb 587 in `each'
7 /usr/lib64/ruby/gems/1.8/gems/railties-3.2.6/lib/rails/engine.rb 587
8 /usr/lib64/ruby/gems/1.8/gems/railties-3.2.6/lib/rails/initializable.rb 30 in `instance_exec'
9 /usr/lib64/ruby/gems/1.8/gems/railties-3.2.6/lib/rails/initializable.rb 30 in `run'
10 /usr/lib64/ruby/gems/1.8/gems/railties-3.2.6/lib/rails/initializable.rb 55 in `run_initializers'
11 /usr/lib64/ruby/gems/1.8/gems/railties-3.2.6/lib/rails/initializable.rb 54 in `each'
12 /usr/lib64/ruby/gems/1.8/gems/railties-3.2.6/lib/rails/initializable.rb 54 in `run_initializers'
13 /usr/lib64/ruby/gems/1.8/gems/railties-3.2.6/lib/rails/application.rb 136 in `initialize!'
14 /usr/lib64/ruby/gems/1.8/gems/railties-3.2.6/lib/rails/railtie/configurable.rb 30 in `send'
15 /usr/lib64/ruby/gems/1.8/gems/railties-3.2.6/lib/rails/railtie/configurable.rb 30 in `method_missing'
16 /home/redmine/config/environment.rb 19
17 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/classic_rails/application_spawner.rb 222 in `require'
18 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/classic_rails/application_spawner.rb 222 in `preload_application'
19 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/classic_rails/application_spawner.rb 181 in `initialize_server'
20 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/utils.rb 572 in `report_app_init_status'
21 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/classic_rails/application_spawner.rb 174 in `initialize_server'
22 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb 204 in `start_synchronously'
23 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb 180 in `start'
24 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/classic_rails/application_spawner.rb 149 in `start'
25 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb 219 in `spawn_rails_application'
26 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server_collection.rb 132 in `lookup_or_add'
27 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb 214 in `spawn_rails_application'
28 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server_collection.rb 82 in `synchronize'
29 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server_collection.rb 79 in `synchronize'
30 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb 213 in `spawn_rails_application'
31 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb 132 in `spawn_application'
32 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/spawn_manager.rb 275 in `handle_spawn_application'
33 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb 357 in `__send__'
34 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb 357 in `server_main_loop'
35 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/lib/phusion_passenger/abstract_server.rb 206 in `start_synchronously'
36 /usr/lib/ruby/gems/1.8/gems/passenger-3.0.12/helper-scripts/passenger-spawn-server 99
这个常量已经弃用了？ 如何替换？