I had successfully installed OP 3.0 stable on Wheezy with Postgresql. Afterwards, I tried to install plug-ins Global Roles and Backlog following the instruction in README:
1. Add plug-ins to the Gemfile.plugins.
2. bundle install
3. RAILS_ENV=“production” bundle exec rake db:migrate
4. RAILS_ENV=“production” bundle exec rake assets:precompile
During the process, there was no error.

I tried to use the plug-ins, here comes the problem:
1. For backlog, I didn’t find a way to create backlog because the backlog section in a project is empty. (I am using admin account, should have the permission)
2. When I tried to create global role, it failed with Internal Error. There is error log in log file:

_Processing by RolesController#create as HTML
Parameters: {“utf8”=>“✓”, “authenticity_token”=>“pAQUAJN0Uxeq99gIgd8lh432guEdzAatzlNgIJ2WyJ4=”, “role”=>{“name”=>“Project Manager”, “permissions”=>[“add_project”, “”]}, “global_role”=>“1”, “copy_workflow_from”=>“”, “commit”=>“Create”}
Completed 500 Internal Server Error in 78.7ms

ActiveModel::ForbiddenAttributes (ActiveModel::ForbiddenAttributes):
strong_parameters (0.2.1) lib/active_model/forbidden_attributes_protection.rb:11:in `sanitize_for_mass_assignment’
activerecord (3.2.17) lib/active_record/attribute_assignment.rb:75:in `assign_attributes’
activerecord (3.2.17) lib/active_record/base.rb:498:in `initialize’
openproject-global_roles (1.0.0) app/models/global_role.rb:17:in `initialize’
openproject-global_roles (1.0.0) lib/open_project/global_roles/patches/roles_controller_patch.rb:47:in `new’
openproject-global_roles (1.0.0) lib/open_project/global_roles/patches/roles_controller_patch.rb:47:in `create_global_role’
openproject-global_roles (1.0.0) lib/open_project/global_roles/patches/roles_controller_patch.rb:34:in `create_with_global_roles’
actionpack (3.2.17) lib/action_controller/metal/implicit_render.rb:4:in `send_action’
actionpack (3.2.17) lib/abstract_controller/base.rb:167:in `process_action’
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actionpack (3.2.17) lib/abstract_controller/callbacks.rb:18:in `block in process_action’
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activesupport (3.2.17) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks’
activesupport (3.2.17) lib/active_support/callbacks.rb:81:in `run_callbacks’
actionpack (3.2.17) lib/abstract_controller/callbacks.rb:17:in `process_action’
actionpack (3.2.17) lib/action_controller/metal/rescue.rb:29:in `process_action’
actionpack (3.2.17) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action’
activesupport (3.2.17) lib/active_support/notifications.rb:123:in `block in instrument’
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actionpack (3.2.17) lib/action_controller/metal/instrumentation.rb:29:in `process_action’
actionpack (3.2.17) lib/action_controller/metal/params_wrapper.rb:207:in `process_action’
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actionpack (3.2.17) lib/abstract_controller/base.rb:121:in `process’
actionpack (3.2.17) lib/abstract_controller/rendering.rb:45:in `process’
actionpack (3.2.17) lib/action_controller/metal.rb:203:in `dispatch’
actionpack (3.2.17) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch’
actionpack (3.2.17) lib/action_controller/metal.rb:246:in `block in action’
actionpack (3.2.17) lib/action_dispatch/routing/route_set.rb:73:in `call’
actionpack (3.2.17) lib/action_dispatch/routing/route_set.rb:73:in `dispatch’
actionpack (3.2.17) lib/action_dispatch/routing/route_set.rb:36:in `call’
journey (1.0.4) lib/journey/router.rb:68:in `block in call’
journey (1.0.4) lib/journey/router.rb:56:in `each’
journey (1.0.4) lib/journey/router.rb:56:in `call’
actionpack (3.2.17) lib/action_dispatch/routing/route_set.rb:608:in `call’
request_store (1.0.5) lib/request_store/middleware.rb:9:in `call’
/opt/openproject/.rvm/gems/ruby-2.1.1/bundler/gems/i18n-js-8801f8d17ef9/lib/i18n/js/middleware.rb:11:in `call’
actionpack (3.2.17) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call’
rack (1.4.5) lib/rack/etag.rb:23:in `call’
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actionpack (3.2.17) lib/action_dispatch/middleware/head.rb:14:in `call’
actionpack (3.2.17) lib/action_dispatch/middleware/params_parser.rb:21:in `call’
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rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context’
rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call’
actionpack (3.2.17) lib/action_dispatch/middleware/cookies.rb:341:in `call’
activerecord (3.2.17) lib/active_record/query_cache.rb:64:in `call’
activerecord (3.2.17) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call’
actionpack (3.2.17) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call’
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activesupport (3.2.17) lib/active_support/callbacks.rb:405:in `__run_callback’
activesupport (3.2.17) lib/active_support/callbacks.rb:385:in `_run_call_callbacks’
activesupport (3.2.17) lib/active_support/callbacks.rb:81:in `run_callbacks’
actionpack (3.2.17) lib/action_dispatch/middleware/callbacks.rb:27:in `call’
actionpack (3.2.17) lib/action_dispatch/middleware/remote_ip.rb:31:in `call’
actionpack (3.2.17) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call’
actionpack (3.2.17) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call’
railties (3.2.17) lib/rails/rack/logger.rb:32:in `call_app’
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railties (3.2.17) lib/rails/rack/logger.rb:16:in `call’
actionpack (3.2.17) lib/action_dispatch/middleware/request_id.rb:22:in `call’
rack (1.4.5) lib/rack/methodoverride.rb:21:in `call’
rack (1.4.5) lib/rack/runtime.rb:17:in `call’
activesupport (3.2.17) lib/active_support/cache/strategy/local_cache.rb:72:in `call’
rack (1.4.5) lib/rack/lock.rb:15:in `call’
rack-cache (1.2) lib/rack/cache/context.rb:136:in `forward’
rack-cache (1.2) lib/rack/cache/context.rb:143:in `pass’
rack-cache (1.2) lib/rack/cache/context.rb:155:in `invalidate’
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rack-cache (1.2) lib/rack/cache/context.rb:51:in `call’
railties (3.2.17) lib/rails/engine.rb:484:in `call’
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railties (3.2.17) lib/rails/railtie/configurable.rb:30:in `method_missing’
/opt/openproject/.rvm/gems/ruby-2.1.1/bundler/gems/rack-protection-5a7d1bd2f05c/lib/rack/protection/frame_options.rb:31:in `call’
/opt/openproject/.rvm/gems/ruby-2.1.1/bundler/gems/rack-protection-5a7d1bd2f05c/lib/rack/protection/json_csrf.rb:18:in `call’
passenger (4.0.37) lib/phusion_passenger/rack/thread_handler_extension.rb:77:in `process_request’
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passenger (4.0.37) lib/phusion_passenger/request_handler/thread_handler.rb:110:in `main_loop’
passenger (4.0.37) lib/phusion_passenger/request_handler.rb:448:in `block (3 levels) in start_threads’_