NameError: uninitialized constant UserHooks::FeelingsHelper

[nvsu]

Dear,

I received below error message when installing by rake "redmine:plugins:migrate RAILS_ENV=production". Please help to fix it. Thank you very much.

redmine/plugins/redmine_niko_cale/lib/user_hooks.rb:2:in <class:UserHooks>' redmine/plugins/redmine_niko_cale/lib/user_hooks.rb:1:in<top (required)>'
redmine/plugins/redmine_niko_cale/init.rb:17:in <top (required)>' redmine/lib/redmine/plugin.rb:155:inblock in load'
redmine/lib/redmine/plugin.rb:146:in each' redmine/lib/redmine/plugin.rb:146:inload'
redmine/config/initializers/30-redmine.rb:21:in <top (required)>' redmine/config/environment.rb:14:in<top (required)>'
Tasks: TOP => redmine:plugins:migrate => environment
(See full trace by running task with --trace)