Search Console has identified that my site is affected by 1 Product snippet structured data issue(s). The following issues were found on the site.

Top critical issues*
Either "offers", "review", or "aggregate rating" should be specified

*Critical issues prevent this page or feature from appearing in Search results, please how can I fix this issue I have tried to read some similar questions on this forum but none has provided a solution. if the problem is that there is no review on this site then how can I remove the review section to prevent this error or should I set the 5-star rating so that all the pages have reviews

There is no smart fix until you have rating on all your listings.

ok but my theme isn't showing where my website visitors can rate for a product so what should I do

The devil can do magic in here....... :-)

Not really the honest way and cheating but it works perfectly. I am doing this about a year or 2 and works for me ...

!important;  First delete in epsilon theme this part in item.php

  <!-- GOOGLE RICH SNIPPETS -->
  <span itemscope itemtype="http://schema.org/Product">
    <meta itemprop="name" content="<?php echo osc_esc_html(osc_item_title()); ?>" />
    <meta itemprop="description" content="<?php echo osc_esc_html(osc_highlight(osc_item_description(), 500)); ?>" />
    <?php if(osc_count_item_resources() > 0) { ?><meta itemprop="image" content="<?php echo $resource_url; ?>" /><?php } ?>
  </span>


Then: change file within oc-includes/osclass/structured-data.php with this code and and thank me later

<?php
/*
 * Copyright 2014 Osclass
 * Copyright 2021 Osclass by OsclassPoint.com
 *
 * Osclass maintained & developed by OsclassPoint.com
 * You may not use this file except in compliance with the License.
 * You may download copy of Osclass at
 *
 *     https://osclass-classifieds.com/download
 *
 * Do not edit or add to this file if you wish to upgrade Osclass to newer
 * versions in the future. Software is distributed on an "AS IS" basis, without
 * warranties or conditions of any kind, either express or implied. Do not remove
 * this NOTICE section as it contains license information and copyrights.
 */
 
function osc_structured_data_title() {
  $text = meta_title();
  return osc_apply_filter('structured_data_title_filter', $text);
}

function osc_structured_data_description() {
  $text = meta_description();
  return osc_apply_filter('structured_data_description_filter', $text);
}

function osc_structured_data_image() {
  $logo_url = '';
  $logo = osc_get_preference('logo', osc_current_web_theme());

  if($logo != '' && file_exists(osc_uploads_path() . $logo)) {
    $path = str_replace(ABS_PATH, '', osc_uploads_path());
    $logo_url = osc_base_url() . $path . $logo;
  } else if (file_exists(osc_base_path() . 'oc-content/themes/' . osc_current_web_theme() . '/images/logo.jpg')) {
    $logo_url = osc_base_url() . 'oc-content/themes/' . osc_current_web_theme() . '/images/logo.jpg';
  } else if (file_exists(osc_base_path() . 'oc-content/themes/' . osc_current_web_theme() . '/images/logo.png')) {
    $logo_url = osc_base_url() . 'oc-content/themes/' . osc_current_web_theme() . '/images/logo.png';
  } else if (file_exists(osc_base_path() . 'oc-content/themes/' . osc_current_web_theme() . '/images/logo.gif')) {
    $logo_url = osc_base_url() . 'oc-content/themes/' . osc_current_web_theme() . '/images/logo.gif';
  }
  
  $url = $logo_url;

  if(osc_is_ad_page()) {
    if(osc_count_item_resources() > 0) {
      $url = osc_resource_url();
    }
  }

  return osc_apply_filter('structured_data_image_filter', $url);
}


function osc_structured_data_footer() {
  if(osc_structured_data_enabled()) {
    $url = osc_get_current_url();
    $image_url = osc_structured_data_image();

    if(osc_is_ad_page()) {
      $url = osc_item_url();
      $location = array(osc_item_country(), osc_item_region(), osc_item_city(), osc_item_address());
      $location = implode(', ', array_filter($location));
    }
    
    $url = osc_apply_filter('structured_data_url_filter', $url);

    if(osc_is_ad_page()) {
?>
<script type="application/ld+json">
{
  "@context": "https://schema.org/",
  "@type": "Product",
  "name": "<?php echo osc_esc_html(osc_item_title()); ?>",
  <?php if($image_url <> '') { ?>"image": "<?php echo osc_esc_html($image_url); ?>",<?php echo PHP_EOL; } ?>
  "description": "<?php echo osc_esc_html(osc_highlight(osc_item_description(), 500)); ?>",
  "sku" : "<?php echo osc_esc_html(osc_total_items()); ?>",
  "isbn" : "<?php echo osc_esc_html(osc_item_user_id()); ?>",

  "offers": {
    "@type": "Offer",
    "itemOffered": "<?php echo osc_esc_html(osc_item_title()); ?>",
    "url": "<?php echo osc_esc_html($url); ?>",
    <?php if(osc_item_price() > 0) { ?>"priceCurrency": "<?php echo osc_esc_html(osc_item_currency()); ?>",<?php echo PHP_EOL; } ?>
    "price": "<?php echo osc_esc_html(osc_item_price() > 0 ? osc_item_price() : 0); ?>",
    "priceValidUntil": "<?php echo date('d-m-Y', strtotime(osc_item_field('dt_pub_date') . ' + 365 days')); ?>",
    "availability": "https://schema.org/InStock"
  },

  "category": {
    "@type": "Category",
    "offer": "<?php echo osc_esc_html(osc_item_category($locale =' “”')); ?>"
  },

  "brand": {
    "@type": "Brand",
    "brand": "<?php $user = User::newInstance()->findByPrimaryKey( osc_item_user_id() ); ?>
                    <?php if($user['b_company'] == 1) { ?>
                    <?php _e('Company'); ?>
                    <?php } else { ?>
                    <?php _e('Private seller'); ?>
                    <?php } ?>"
  },

  "seller": {
    "@type": "Seller",
    "seller": "<?php echo osc_esc_html(osc_user_name()); ?>"
  },


  "aggregateRating": {
    "@type": "AggregateRating",
    "ratingValue": "4.5",
    "bestRating": "5",
    "worstRating": "0",
    "ratingCount": "<?php echo osc_esc_html(osc_user_items_validated()); ?>",
    "reviewCount": "<?php echo osc_esc_html(osc_user_items_validated()); ?>"

  }

  <?php osc_run_hook('structured_data_footer'); ?>
}
</script>

    <?php } else { ?>
<script type="application/ld+json">
{
  "@context": "http://schema.org/",
  "@type": "Organization",
  <?php if($image_url <> '') { ?>"logo": "<?php echo osc_esc_html($image_url); ?>",<?php echo PHP_EOL; } ?>
   "name": "<?php echo osc_esc_html('osc_item_title'); ?>",
   "url": "<?php echo osc_esc_html($url); ?>"
  <?php osc_run_hook('structured_data_footer'); ?>
}
</script>
  <?php 
    }
  } 
} 

osc_add_hook('footer', 'osc_structured_data_footer');


function osc_structured_data_header() {
  if(osc_structured_data_enabled()) {
    $url = osc_get_current_url();
    $image_url = osc_structured_data_image();

    if(osc_is_ad_page()) {
      $url = osc_item_url();
      $location = array(osc_item_country(), osc_item_region(), osc_item_city(), osc_item_address());
      $location = implode(', ', array_filter($location));
    }

?>
<!-- Facebook Open Graph Tags-->
<meta property="og:title" content="<?php echo osc_esc_html(osc_structured_data_title()); ?>" />
<meta property="og:site_name" content="<?php echo osc_esc_html(osc_structured_data_title()); ?>"/>
<meta property="og:url" content="<?php echo osc_esc_html($url); ?>" />
<meta property="og:description" content="<?php echo osc_esc_html(osc_highlight(osc_structured_data_description(), 200)); ?>" />
<meta property="og:locale" content="<?php echo osc_esc_html(osc_current_user_locale()); ?>" />
<meta property="og:image" content="<?php echo $image_url; ?>" />
<?php if(osc_is_ad_page()) { ?>
<?php if($location <> '') { ?><meta property="og:place" content="<?php echo osc_esc_html($location); ?>" /><?php echo PHP_EOL; } ?>
<meta property="og:type" content="product" />
<meta property="product:availability" content="<?php echo __('Available'); ?>" />
<meta property="product:retailer_item_id" content="<?php echo osc_esc_html(osc_item_id()); ?>" />
<?php if(osc_item_price() > 0) { ?><meta property="product:price:amount" content="<?php echo osc_esc_html(osc_item_price()); ?>" /><?php echo PHP_EOL; } ?>
<?php if(osc_item_price() > 0) { ?><meta property="product:price:currency" content="<?php echo osc_esc_html(osc_item_currency()); ?>" /><?php echo PHP_EOL; } ?>
<?php } ?>

<!-- Twitter Tags-->
<meta name="twitter:card" content="summary" />
<meta name="twitter:site" content="@<?php echo osc_esc_html(osc_item_contact_name() <> '' ? osc_item_contact_name() : __('OSCLASS')); ?>" />
<meta name="twitter:title" content="<?php echo osc_esc_html(osc_structured_data_title()); ?>" />
<meta name="twitter:description" content="<?php echo osc_esc_html(osc_highlight(osc_structured_data_description(), 200)); ?>" />
<meta name="twitter:image" content="<?php echo osc_esc_html($image_url); ?>" />

<?php osc_run_hook('structured_data_header'); ?>
<?php 
  } 
}

osc_add_hook('header', 'osc_structured_data_header');

?>


Ok thanks

@mwindey
You avoided error in validation tool.
After 2 years do you see that you woukd get any benefit out of that?

@MB Themes

Yes pages without good snippets are not ranked in google... for me it works and with seo score 100% 

yea but still it does not say if it made difference

None