internal error when clicking new

[Kochleffel]

when clickin on a new schedule get in Browser internal error.

here is what the logifle tells:

Started GET "/redmine/recurring_tasks/new?issue_id=551" for 127.0.0.1 at 2024-02-23 15:32:44 +0100
Processing by RecurringTasksController#new as HTML
  Parameters: {"issue_id"=>"551"}
  Current user: user (id=1)
  Rendering plugins/redmine_recurring_tasks/app/views/recurring_tasks/new.html.erb within layouts/base
  Rendered plugins/redmine_recurring_tasks/app/views/recurring_tasks/_form.html.erb (5.0ms)
  Rendered plugins/redmine_recurring_tasks/app/views/recurring_tasks/new.html.erb within layouts/base (7.3ms)
Completed 500 Internal Server Error in 27ms (ActiveRecord: 9.9ms)
  
ActionView::Template::Error (incompatible character encodings: UTF-8 and CP850):
    50:                 <%= RecurringTask.human_attribute_name(:time) %>
    51:                 <%= f.time_select :time, minute_step: 5 %>
    52:               </label>
    53:               (<%= Time.now.zone %>)
    54:             </p>
    55:           </td>
    56: 
  
plugins/redmine_recurring_tasks/app/views/recurring_tasks/_form.html.erb:53:in `block in _plugins_redmine_recurring_tasks_app_views_recurring_tasks__form_html_erb__634507993_849684974720'
plugins/redmine_recurring_tasks/app/views/recurring_tasks/_form.html.erb:1:in `_plugins_redmine_recurring_tasks_app_views_recurring_tasks__form_html_erb__634507993_849684974720'
plugins/redmine_recurring_tasks/app/views/recurring_tasks/new.html.erb:3:in `_plugins_redmine_recurring_tasks_app_views_recurring_tasks_new_html_erb__250048415_849684875200'

Environment:
Redmine version 4.2.3.stable
Ruby version 2.6.9-p207 (2021-11-24) [x64-mingw32]
Rails version 5.2.6
Environment production
Database adapter Mysql2
Mailer queue ActiveJob::QueueAdapters::AsyncAdapter
Mailer delivery smtp
SCM:
Git 2.34.0
Filesystem
Redmine plugins:
redmine_recurring_tasks 0.3.4