500 error occurs when create ticket about redmine_full_text_search HOT 7 CLOSED

diff --git a/init.rb b/init.rb
index cc88405..f651997 100644
--- a/init.rb
+++ b/init.rb
@@ -2,6 +2,7 @@ require_dependency "full_text_search/hooks/search_index_options_content_bottom_h
 require_dependency "full_text_search/hooks/issues_show_description_bottom_hook"
 require_dependency "full_text_search/hooks/similar_issues_helper"
 require "full_text_search/searcher"
+require_dependency "full_text_search/hooks/search_helper"
 
 Redmine::Plugin.register :full_text_search do
   name 'Full Text Search plugin'
@@ -31,5 +32,4 @@ Rails.configuration.to_prepare do
   Journal.include(FullTextSearch::SimilarSearcher::Model)
   SearchHelper.prepend(FullTextSearch::Hooks::SearchHelper)
   SearchController.prepend(FullTextSearch::Hooks::ControllerSearchIndex)
-  IssuesHelper.include(FullTextSearch::Hooks::SimilarIssuesHelper)
 end
diff --git a/lib/full_text_search/hooks/similar_issues_helper.rb b/lib/full_text_search/hooks/similar_issues_helper.rb
index ac7d729..b8ce0d6 100644
--- a/lib/full_text_search/hooks/similar_issues_helper.rb
+++ b/lib/full_text_search/hooks/similar_issues_helper.rb
@@ -22,3 +22,4 @@ module FullTextSearch
     end
   end
 end
+IssuesHelper.prepend(FullTextSearch::Hooks::SimilarIssuesHelper)

irb(main):004:0* IssuesHelper.ancestors
=> [FullTextSearch::Hooks::SimilarIssuesHelper, FullTextSearch::Hooks::SettingsHelper, IssuesHelper, Redmine::Export::PDF::IssuesPdfHelper, ApplicationHelper, Redmine::Helpers::URL, Redmine::Hook::Helper, Redmine::Themes::Helper, Redmine::SudoMode::Helper, Redmine::Pagination::Helper, GravatarHelper::PublicMethods, Redmine::I18n, Redmine::WikiFormatting::Macros::Definitions]

irb(main):005:0> IssuesHelper.instance_methods
=> [:render_similar_issues, :display_score?, :render_issue_tooltip, :issue_list, :grouped_issue_list, :issue_heading, :render_issue_subject_with_tree, :render_descendants_tree, :render_issue_relations, :issue_estimated_hours_details, :issue_spent_hours_details, :bulk_edit_error_messages, 

.... snip ...

1 vagrant@ubuntu-xenial:~/work/redmine-3.4.6⟫ bin/rake about
About your application's environment
Rails version             4.2.8
Ruby version              2.3.1-p112 (x86_64-linux-gnu)
RubyGems version          2.5.2.1
Rack version              1.6.10
Middleware                Rack::Sendfile, Rack::ContentLength, ActionDispatch::Static, Rack::Lock, #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0x0000000456b3b0>, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, Rails::Rack::Logger, ActionDispatch::ShowExceptions, ActionDispatch::DebugExceptions, ActionDispatch::RemoteIp, ActionDispatch::Callbacks, ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ParamsParser, ActionDispatch::XmlParamsParser, Rack::Head, Rack::ConditionalGet, Rack::ETag, RequestStore::Middleware, OpenIdAuthentication
Application root          /home/vagrant/work/redmine-3.4.6
Environment               production
Database adapter          postgresql
Database schema version   20170810052427