Redmine

I work on my redmine plugin and I managed to trash redmine to the point where whatever I click it results in:

Completed 500 Internal Server Error in 1589ms

ActionView::Template::Error (undefined method `html_safe' for #<Hash:0x7fd326fdc0e0>):
    54:     <div id="sidebar">
    55:         <%= yield :sidebar %>
    56:         <%= view_layouts_base_sidebar_hook_response %>
    57:     </div>
    58: 
    59:     <div id="content">
    60:         <%= render_flash_messages %>
  app/helpers/application_helper.rb:263:in `render_flash_messages'
  app/helpers/application_helper.rb:262:in `render_flash_messages'