skill-assessment-app/app/views/candidate/_checkbox.html.erb

<%
  question.input_options.each do | option |
  option_id = "#{option.parameterize}_#{question.to_i}"
%>
  <div class="form-group-multiples">
    <input type="checkbox" class="checkbox"
           name="input_checkbox_<%= question.to_i %>[]"
           id="check_<%= option_id %>"
           value="<%= option %>"
           <%= "checked=\"checked\"" if Array(question.answer).include?(option) %>
           >
    <label for="check_<%= option_id %>"><%= option %></label>
  </div>
<% end %>

-- MOVE TO FLASH HASH --
<div class="error">Please select or enter an answer.</div>