Problem at install

[Kheprys]

I encounter a problem at the install of your version (with epics) of redmine backlog, as logs have more value than speech, here is my redmine configuration followed by logs of the install :

Configuration :
Environment: Redmine version : 3.2.0.stable Ruby version : 2.2.4-p230 (2015-12-16) [x86_64-linux] Rails version : 4.2.5 Environment : production Database adapter : Mysql2 SCM: Subversion : 1.8.8 Git : 1.9.1 Filesystem Gitolite : 1.9.1 Redmine plugins: redmine_backlogs : v1.0.6 redmine_gitolite : 0.0.1

Logs :
`
$ bundle exec rake redmine:backlogs:install
/opt/redmine/.rvm/gems/ruby-2.2.4/gems/htmlentities-4.3.1/lib/htmlentities/mappings/expanded.rb:465: warning: duplicated key at line 466 ignored: "inodot"
3.2.0.stable. You are running backlogs v1.0.6, latest version is 1.0.6

Redmine Backlogs Installer

Installing to the production environment.
Fetching card labels from http://git.gnome.org...done!
Configuring epic and task trackers...

Which trackers do you want to use for your epics?

1. Bug
2. Stories
3. Support
4. Epics
   Separate values with a space (e.g. 1 3): 4
   You selected the following trackers: Epics. Is this correct? (y/n) y

Which trackers do you want to use for your stories?
rake aborted!
NoMethodError: undefined method include?' for nil:NilClass /opt/redmine/redmine/plugins/redmine_backlogs/lib/tasks/install.rake:134:inblock (4 levels) in <top (required)>'
/opt/redmine/.rvm/gems/ruby-2.2.4/gems/activerecord-4.2.5/lib/active_record/relation/query_methods.rb:251:in block in select' /opt/redmine/.rvm/gems/ruby-2.2.4/gems/activerecord-4.2.5/lib/active_record/relation/query_methods.rb:251:inselect'
/opt/redmine/.rvm/gems/ruby-2.2.4/gems/activerecord-4.2.5/lib/active_record/relation/query_methods.rb:251:in select' /opt/redmine/redmine/plugins/redmine_backlogs/lib/tasks/install.rake:134:inblock (3 levels) in <top (required)>'
/opt/redmine/.rvm/gems/ruby-2.2.4/gems/rake-11.2.2/exe/rake:27:in <top (required)>' /opt/redmine/.rvm/gems/ruby-2.2.4/bin/ruby_executable_hooks:15:ineval'
/opt/redmine/.rvm/gems/ruby-2.2.4/bin/ruby_executable_hooks:15:in <main>' Tasks: TOP => redmine:backlogs:install (See full trace by running task with --trace)