# File lib/yapra/pipeline.rb, line 109
  def raise_load_error load_error_stack, command
    load_error = LoadError.new("#{command['module']} module is not found.")
    backtrace = load_error.backtrace || []
    load_error_stack.each do |e|
      backtrace << "#{e.class.name} in '#{e.message}'"
      backtrace = backtrace + e.backtrace
    end
    load_error.set_backtrace(backtrace)
    raise load_error
  end