Redmine

I am trying to install easy_gantt in Redmine application, but getting error while installing it. Need help.

Environment:
Redmine version 3.2.2.stable
Ruby version 2.3.1-p112 (2016-04-26) [x86_64-linux]
Rails version 4.2.5.2

[root@redminedev plugins]# bundle exec rake db:migrate RAILS_ENV=production
(in /var/www/redmine)
rake aborted!
NoMethodError: undefined method `=~' for #<Pathname:0x0000000638c150>
/usr/local/rvm/gems/ruby-2.3.1/gems/deface-1.0.2/lib/deface/railtie.rb:50:in `block (3 levels) in <class:Railtie>'
/usr/local/rvm/gems/ruby-2.3.1/gems/deface-1.0.2/lib/deface/railtie.rb:50:in `reject!'
/usr/local/rvm/gems/ruby-2.3.1/gems/deface-1.0.2/lib/deface/railtie.rb:50:in `block (2 levels) in <class:Railtie>'
/usr/local/rvm/gems/ruby-2.3.1/gems/deface-1.0.2/lib/deface/railtie.rb:48:in `each'
/usr/local/rvm/gems/ruby-2.3.1/gems/deface-1.0.2/lib/deface/railtie.rb:48:in `block in <class:Railtie>'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:30:in `instance_exec'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:30:in `run'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:55:in `block in run_initializers'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `each'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `tsort_each_child'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `each'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `tsort_each_child'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `each'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `tsort_each_child'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `each'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `tsort_each_child'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `each'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `tsort_each_child'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `each'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `tsort_each_child'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `each'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:44:in `tsort_each_child'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/initializable.rb:54:in `run_initializers'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/application.rb:352:in `initialize!'
/var/www/redmine/config/environment.rb:14:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.3.1/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
/usr/local/rvm/gems/ruby-2.3.1/gems/polyglot-0.3.5/lib/polyglot.rb:65:in `require'
/usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-4.2.5.2/lib/active_support/dependencies.rb:274:in `block in require'
/usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-4.2.5.2/lib/active_support/dependencies.rb:240:in `load_dependency'
/usr/local/rvm/gems/ruby-2.3.1/gems/activesupport-4.2.5.2/lib/active_support/dependencies.rb:274:in `require'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/application.rb:328:in `require_environment!'
/usr/local/rvm/gems/ruby-2.3.1/gems/railties-4.2.5.2/lib/rails/application.rb:457:in `block in run_tasks_blocks'
/usr/local/rvm/gems/ruby-2.3.1/gems/rake-11.2.2/exe/rake:27:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.3.1/bin/ruby_executable_hooks:15:in `eval'
/usr/local/rvm/gems/ruby-2.3.1/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => db:migrate => environment
(See full trace by running task with --trace)