Redmine got 500 error after installed this plugin

[rikki]

Internal error

An error occurred on the page you were trying to access.
If you continue to experience problems please contact your Redmine administrator for assistance.

If you are the Redmine administrator, check your log files for details about the error.

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The log shows that a method called "delete_if" is not been claimed

Started GET "/issues/5" for 111.193.182.23 at 2014-12-15 18:50:50 +0800
Processing by IssuesController#show as HTML
Parameters: {"id"=>"5"}
Current user: zhichao.lv (id=1)
Rendered issues/_action_menu.html.erb (2.7ms)
Rendered issue_relations/_form.html.erb (1.4ms)
Rendered issues/_relations.html.erb (2.2ms)
Rendered issues/_history.html.erb (24.4ms)
Rendered issues/_action_menu.html.erb (1.8ms)
Rendered issues/_form_custom_fields.html.erb (0.1ms)
Rendered issues/_attributes.html.erb (11.6ms)
Rendered plugins/redmine_mentions/app/views/hooks/redmine_mentions/_edit_mentionable.html.erb (3.9ms)
Rendered issues/_form.html.erb (26.0ms)
Rendered issues/_edit.html.erb (26.7ms)
Rendered issues/show.html.erb within layouts/base (75.3ms)
Completed 500 Internal Server Error in 132ms

ActionView::Template::Error (undefined method delete_if' for #<User::ActiveRecord_Relation:0x00000007780828>): 4: <% regex_find = '/\B'+Setting.plugin_redmine_mentions['trigger']+'(\w*)$/i'%> 5: 6: 7: <%users= @project.users.delete_if{|u| (u.type != 'User' || u.mail.empty?)}%> 8: <%users_regex=users.collect{|u| "#{Setting.plugin_redmine_mentions['trigger']}#{u.login}"}.join('|')%> 9: <% regex_highlight = '/\B('+users_regex+')/g' %> 10: <script> lib/redmine/hook.rb:119:inblock (2 levels) in render_on'
lib/redmine/hook.rb:117:in map' lib/redmine/hook.rb:117:inblock in render_on'
lib/redmine/hook.rb:61:in block (2 levels) in call_hook' lib/redmine/hook.rb:61:ineach'
lib/redmine/hook.rb:61:in block in call_hook' lib/redmine/hook.rb:58:intap'
lib/redmine/hook.rb:58:in call_hook' lib/redmine/hook.rb:167:incall_hook'
app/views/issues/_form.html.erb:44:in block in _app_views_issues__form_html_erb___1797317687149565551_74475560' app/helpers/application_helper.rb:1023:inlabelled_fields_for'
app/views/issues/_form.html.erb:1:in _app_views_issues__form_html_erb___1797317687149565551_74475560' app/views/issues/_edit.html.erb:8:inblock in _app_views_issues__edit_html_erb__972739190247922089_74614380'
app/helpers/application_helper.rb:1016:in labelled_form_for' app/views/issues/_edit.html.erb:1:in_app_views_issues__edit_html_erb__972739190247922089_74614380'
app/views/issues/show.html.erb:132:in _app_views_issues_show_html_erb__17552338068304259_77461980' app/controllers/issues_controller.rb:128:inblock (2 levels) in show'
app/controllers/issues_controller.rb:125:in `show'

And redmine info is here:
Environment:
Redmine version 2.6.0.devel
Ruby version 2.1.5-p273 (2014-11-13) [x86_64-linux]
Rails version 4.1.8
Environment production
Database adapter Mysql2
SCM:
Git 1.7.10.4
Filesystem
Redmine plugins:
redmine_mentions 0.0.1

[galexrt]

I'm getting the same error as @rikki I'm using the same version of redmine and ruby as him

Processing by IssuesController#new as HTML
  Parameters: {"project_id"=>"iito-hso-mgmt-dm"}
  Current user: Galexrt (id=3)
  Rendered issues/_form_custom_fields.html.erb (4.4ms)
  Rendered issues/_attributes.html.erb (21.8ms)
  Rendered plugins/redmine_mentions/app/views/hooks/redmine_mentions/_edit_mentionable.html.erb (3.3ms)
  Rendered issues/_form.html.erb (36.6ms)
  Rendered issues/new.html.erb within layouts/base (38.0ms)
Completed 500 Internal Server Error in 66ms

ActionView::Template::Error (undefined method `delete_if' for #<User::ActiveRecord_Relation:0x007f9318039550>):
    4: <% regex_find = '/\B'+Setting.plugin_redmine_mentions['trigger']+'(\w*)$/i'%>
    5:
    6:
    7: <%users= @project.users.delete_if{|u| (u.type != 'User' || u.mail.empty?)}%>
    8: <%users_regex=users.collect{|u| "#{Setting.plugin_redmine_mentions['trigger']}#{u.login}"}.join('|')%>
    9: <% regex_highlight = '/\B('+users_regex+')/g' %>
   10: <script>
  lib/redmine/hook.rb:120:in `block (2 levels) in render_on'
  lib/redmine/hook.rb:118:in `map'
  lib/redmine/hook.rb:118:in `block in render_on'
  lib/redmine/hook.rb:62:in `block (2 levels) in call_hook'
  lib/redmine/hook.rb:62:in `each'
  lib/redmine/hook.rb:62:in `block in call_hook'
  lib/redmine/hook.rb:59:in `tap'
  lib/redmine/hook.rb:59:in `call_hook'
  lib/redmine/hook.rb:168:in `call_hook'
  app/views/issues/_form.html.erb:44:in `block in _app_views_issues__form_html_erb__1231411727637894253_70134883614000'
  app/helpers/application_helper.rb:1024:in `labelled_fields_for'
  app/views/issues/_form.html.erb:1:in `_app_views_issues__form_html_erb__1231411727637894253_70134883614000'
  app/views/issues/new.html.erb:11:in `block in _app_views_issues_new_html_erb__2465577942882988662_70134881425360'
  app/helpers/application_helper.rb:1017:in `labelled_form_for'
  app/views/issues/new.html.erb:5:in `_app_views_issues_new_html_erb__2465577942882988662_70134881425360'
  app/controllers/issues_controller.rb:144:in `block (2 levels) in new'
  app/controllers/issues_controller.rb:143:in `new'

For now I deactivated the plugin to being able to create issues, but I hope this being fixed fast. 😃

[zohar]

Same error here. redmine 2.2.1

Note the errors at the end:

Started PUT "//issues/38402" for 33.41.33.41 at Mon Aug 03 13:45:58 +0300 2015
Processing by IssuesController#update as HTML
  Parameters: {"issue"=>{"parent_issue_id"=>"", "done_ratio"=>"0", "priority_id"=>"4", "start_date"=>"2015-08-03 00:00:00", "notes"=>"Looking in logs (@username )", "assigned_to_id"=>"", "tracker_id"=>"4", "description"=>"@otheruser did you receive any mail/notification?", "fixed_version_id"=>"", "private_notes"=>"0", "subject"=>"Testing mentions", "lock_version"=>"3", "is_private"=>"0", "status_id"=>"1", "due_date"=>"", "estimated_hours"=>"", "project_id"=>"00000"}, "commit"=>"Submit", "time_entry"=>{"comments"=>"", "hours"=>"", "activity_id"=>"9"}, "utf8"=>"✓", "attachments"=>{"1"=>{"description"=>""}}, "id"=>"38402", "last_journal_id"=>"94418", "authenticity_token"=>"xxxxxxx"}
  Current user: username (id=4)
Completed 500 Internal Server Error in 416ms

SyntaxError (/usr/local/redmine-2.2.1/plugins/redmine_mentions/app/models/mention_mailer.rb:3: syntax error, unexpected ':', expecting kEND
  default from: Setting.mail_from
               ^
/usr/local/redmine-2.2.1/plugins/redmine_mentions/app/models/mention_mailer.rb:12: syntax error, unexpected ':', expecting ')'
    mail(to: user.mail, subject: "[#{@issu...
            ^
/usr/local/redmine-2.2.1/plugins/redmine_mentions/app/models/mention_mailer.rb:12: syntax error, unexpected ':', expecting '='
...  mail(to: user.mail, subject: "[#{@issue.tracker.name} ##{@...
                              ^
/usr/local/redmine-2.2.1/plugins/redmine_mentions/app/models/mention_mailer.rb:12: syntax error, unexpected ')', expecting kEND):
  app/models/journal.rb:52:in `save'
  app/models/issue.rb:1362:in `create_journal'
  app/models/issue.rb:965:in `save_issue_with_child_records'
  app/models/issue.rb:952:in `save_issue_with_child_records'
  app/controllers/issues_controller.rb:176:in `update'