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After clean cache [Advanced Parameters -> Performance] from prestashop backend we got this error PrestaShop


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hello all
i am using prestashop some page given error 500
then am clear cache from admin>administrator>performance>catche >clear all

then I got a blank page

then I remove/var/cache/dev or prod directory but the problem still the same.

thanks in advance.

Fatal error: Uncaught Error: Class 'Db' not found in /opt/bitnami/apps/prestashop/htdocs/config/alias.php:48 Stack trace: #0 /opt/bitnami/apps/prestashop/htdocs/config/alias.php(53): pSQL('configuration') #1 /opt/bitnami/apps/prestashop/htdocs/classes/Configuration.php(155): bqSQL('configuration') #2 /opt/bitnami/apps/prestashop/htdocs/classes/Configuration.php(209): ConfigurationCore::loadConfiguration() #3 /opt/bitnami/apps/prestashop/htdocs/classes/PrestaShopAutoload.php(171): ConfigurationCore::get('PS_DISABLE_OVER...') #4 /opt/bitnami/apps/prestashop/htdocs/classes/PrestaShopAutoload.php(130): PrestaShopAutoload->generateIndex() #5 [internal function]: PrestaShopAutoload->load('Db') #6 /opt/bitnami/apps/prestashop/htdocs/config/alias.php(48): spl_autoload_call('Db') #7 /opt/bitnami/apps/prestashop/htdocs/config/alias.php(53): pSQL('configuration') #8 /opt/bitnami/apps/prestashop/htdocs/classes/Configuration.php(155): bqSQL('configuration') #9 /opt/bitnami/apps/prestashop/htdocs/classes/Configuration.php(209): Configu in /opt/bitnami/apps/prestashop/htdocs/config/alias.php on line 48

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