YAK delete item

the shopping cart of the YAK plugin for wordpress works fine, but the delete item button doesn’t works. I clic the delete button “-“, the cart refresh but doesn’t detele the item.

My page is https://www.nerdbooks.co and my shopping cart is in https://www.nerdbooks.co/carritodecompras/

<tr>
<td class=”yak_left”>id_type . ‘=’ . $item->id ?>”><?php echo $item->name ?></td>
<td class=”yak_numeric”><?php echo yak_format_money($item->price); ?></td>
<td class=”yak_center”><input id=”<?php echo $qtyid ?>” name=”<?php echo $qtyid ?>” type=”<?php echo $quantity_input_type ?>” style=”text-align: right” value=”<?php echo $item->quantity ?>” size=”<?php echo yak_get_option(QUANTITY_INPUT_SIZE, 3) ?>” maxlength=”<?php echo yak_get_option(QUANTITY_INPUT_SIZE, 3) ?>” onkeydown=”if (event.keyCode == 13) {return false;}” /></td>
<td class=”yak_numeric”><?php echo yak_format_money($item->get_total()) ?></td>
<td><button id=”deletebutton_<?php echo $item->id . ‘_’ . $item->cat_id ?>” class=”yak_button” type=”submit” onclick=”return deleteProduct(‘<?php echo $qtyid ?>’)”><?php _e(‘ – ‘, ‘yak’) ?></button></td>
</tr>