我已经安装了opencart 3.0主题，我必须创建数量增加或减少，但没有工作

I have installed the extension quantity increase or decrease in opencart 3.0 but it didnt work on my plaza theme

i have tried many ways i have change the code but it not working on my front end

                <div class="form-group">
                    <div class="quantity-box">
                        <label class="control-label" for="input-quantity">{{ entry_qty }}</label>
                        <div class="quantity-content">
                              <input type="button" id="plus" value="&#43;" class="form-control"/>  
                            <input type="text" name="quantity" value="{{ minimum }}" size="2" id="input-quantity" class="form-control" />                   
                              <input type="button" id="minus" value="-" class="form-control" />  
                        </div>
                    </div>
                    <input type="hidden" name="product_id" value="{{ product_id }}" />
                    <div class="product-actions">
                        <button type="button" id="button-cart" data-loading-text="{{ text_loading }}" class="btn">{{ button_cart }}</button>
                        <div class="wishlist-compare">
                            <button class="btn-wishlist btn btn-default" type="button" title="{{ button_wishlist }}" onclick="wishlist.add('{{ product_id }}');">{{ button_wishlist }}</button>
                            <button class="btn-compare btn btn-default" type="button" title="{{ button_compare }}" onclick="compare.add('{{ product_id }}');">{{ button_compare }}</button>
                        </div>
                    </div>
                </div>
                {% if minimum > 1 %}
                    <div class="alert alert-info"><i class="fa fa-info-circle"></i> {{ text_minimum }}</div>
                {% endif %}

I think {{ minimum }} this code is not working on my product page