Suddenly Lockout From Store Admin Panel, Total Blank Page

Very weird, I have setup a clone of our live production store in the directory of our live production site, I have closed that cloned store but I cannot access the administrative panel of the CS Cart live production store but I can of the cloned store.

I submitted a support ticket asap but I this is for me a very urgent matter, I have cleared the /var/cache folder already of the live production store where by the way orders can be taken but I cannot take care of these orders.

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I turned on the error reporting and found this:

Fatal error: Uncaught --> Smarty: Unable to load template tygh 'addons/ab__hide_product_description/hooks/index/styles.post.tpl' in 'common/styles.tpl' <-- thrown in /home/pasioonline/public_html/app/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php on line 129

Followed the instructions as posted in a similar thread - https://forum.cs-cart.com/topic/44313-adminshop-blank-page-after-server-upgrade/#entry247377

// Cache backend
// Available backends: file, sqlite, database, redis, xcache, apc, apcu
// To use sqlite cache the "sqlite3" PHP module should be installed
// To use xcache cache the "xcache" PHP module should be installed
// To use apc cache the "apc" PHP module should be installed
// To use apcu cache the PHP version should be >= 7.x and the "apcu" PHP module should be installed
$config['cache_backend'] = 'file';
$config['cache_redis_server'] = 'localhost';
$config['cache_redis_global_ttl'] = 0; // set this if your cache size reaches Redis server memory size

I switched the cache backed from "apcu" to "file" as shown here before and voilá it works.