     <span class="help-block">Help block with error</span>
                </div>

                <!-- checkbox -->
                <div class="form-group">
                  <div class="checkbox">
                    <label>
                      <input type="checkbox">
                      Checkbox 1
                    </label>
                  </div>

                  <div class="checkbox">
                    <label>
                      <input type="checkbox">
                      Checkbox 2
   