Redmine DMSF

The code in the controller actions renders an error to the user when the zip file which should be send is not found. The error is: File error:

# dmsf_controller.rb

  def entries_email
    if params[:email][:to].strip.blank?
      flash[:error] = l(:error_email_to_must_be_entered)
    else
      DmsfMailer.deliver_send_documents @project, params[:email].permit!, User.current
      if File.exist?(params[:email][:zipped_content])
        File.delete(params[:email][:zipped_content])
      else
        flash[:error] = l(:header_minimum_filesize) # <--- will always be raised
      end
      flash[:notice] = l(:notice_email_sent, params[:email][:to])
    end
    redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
  end