When adding a product to a category, such an error.

When adding a product to a category, such an error.

If this topic is in the wrong place, I apologize.
Hello everyone, I created categories, I add a product, and when I go to a category in which there is a product, the following error occurs: "Undefined constant "_JSHOP_ORDER_BY"
Tell me which way to dig? can someone already faced?
Joomla ‎4.2.4‎
JoomShopping 5.1.1



my code form_filters.php:

<?php
/**
* @version 5.0.0 15.09.2018
* @author MAXXmarketing GmbH
* @package Jshopping
* @copyright Copyright (C) 2010 webdesigner-profi.de. All rights reserved.
* @license GNU/GPL
*/
defined('_JEXEC') or die();
?>
<form action="<?php print $this->action;?>" method="post" name="sort_count" id="sort_count" class="form-horizontal">
<div class="form_sort_count">
<?php if ($this->config->show_sort_product || $this->config->show_count_select_products) : ?>
<div class="block_sorting_count_to_page">
<?php if ($this->config->show_sort_product) : ?>
<div class="control-group box_products_sorting d-flex">
<div class="control-label mt-2">
<?php print JText::_('JSHOP_ORDER_BY');?>:
</div>
<div class="controls">
<div class="input-group">
<?php echo $this->sorting?>
<span class="icon-arrow" id="submit_product_list_filter_sort_dir">
<?php if ($this->orderby==1){?>
<span class="icon-arrow-down"></span>
<?php }else{?>
<span class="icon-arrow-up"></span>
<?php }?>
</span>
</div>
</div>
</div>
<?php endif; ?>
<?php if ($this->config->show_count_select_products) : ?>
<div class="control-group box_products_count_to_page d-flex">
<div class="control-label mt-2">
<?php print JText::_('JSHOP_DISPLAY_NUMBER').": "; ?>
</div>
<div class="controls">
<?php echo $this->product_count?>
</div>
</div>
<?php endif; ?>
</div>
<?php endif; ?>

<?php if ($this->config->show_product_list_filters && $this->filter_show) : ?>

<?php if ($this->config->show_sort_product || $this->config->show_count_select_products) : ?>
<div class="margin_filter"></div>
<?php endif; ?>

<div class="filter_mob_head" id="filter_mob_head">
<span class="icon-play-2"></span>
<?php print JText::_('JSHOP_FILTERS')?>
</div>
<div class="jshop filters">
<div class="box_cat_man d-flex">
<?php if ($this->filter_show_category) : ?>
<div class = "control-group box_category d-flex">
<div class = "control-label mt-2">
<?php print JText::_('JSHOP_CATEGORY').": "; ?>
</div>
<div class = "controls"><?php echo $this->categorys_sel?></div>
</div>
<?php endif; ?>
<?php if ($this->filter_show_manufacturer) : ?>
<div class="control-group box_manufacrurer d-flex">
<div class="control-label mt-2">
<?php print JText::_('JSHOP_MANUFACTURER').": "; ?>
</div>
<div class="controls">
<?php echo $this->manufacuturers_sel; ?>
</div>
</div>
<?php endif; ?>
<?php print $this->_tmp_ext_filter_box;?>
</div>

<?php if (\JSHelper::getDisplayPriceShop()) : ?>
<div class="filter_price d-sm-flex">
<div class="control-group box_price_from_to d-flex">
<div class="control-label mt-2">
<?php print JText::_('JSHOP_PRICE')?> (<?php print $this->config->currency_code?>):
</div>
<div class="controls form-inline d-flex">
<span class="input-append">
<input type="text" class="input form-control" name="fprice_from" id="price_from" size="7" placeholder="<?php print \JText::_('JSHOP_FROM')?>" value="<?php if ($this->filters['price_from']>0) print $this->filters['price_from']?>" />
</span>
<span class="price_ftspace mt-2">-</span>
<span class="input-append">
<input type="text" class="input form-control" name="fprice_to" id="price_to" size="7" placeholder="<?php print \JText::_('JSHOP_TO')?>" value="<?php if ($this->filters['price_to']>0) print $this->filters['price_to']?>" />
</span>
</div>

</div>

<?php print $this->_tmp_ext_filter;?>
<div class="control-group box_button">
<div class="controls d-flex align-items-center">
<input type="button" class="btn button btn-primary" id="submit_product_list_filter" value="<?php print JText::_('JSHOP_GO')?>">
<span class="clear_filter"><a href="#" class="btn btn-secondary" id="clear_product_list_filter"><?php print JText::_('JSHOP_CLEAR_FILTERS')?></a></span>
</div>
</div>
</div>
<?php endif; ?>
</div>
<?php endif; ?>
</div>
<input type="hidden" name="orderby" id="orderby" value="<?php print $this->orderby?>">
<input type="hidden" name="limitstart" value="0">
</form>

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Aw: When adding a product to a category, such an error.

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Error in other file.

Aw: When adding a product to a category, such an error.

turned on debug mode, like this:

Aw: When adding a product to a category, such an error.

...
see row 18