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I have the same problem too.

Upgraded from PS1.7.4.2 to PS1.7.7.2, then I enabled a template ad both back office and front office stopped working:

Cita

Fatal error: Uncaught Symfony\Component\Yaml\Exception\ParseException: A YAML file cannot contain tabs as indentation at line 69 (near " - ps_shoppingcart"). in /var/www/vhosts/miosito.eu/httpdocs/vendor/symfony/symfony/src/Symfony/Component/Yaml/Parser.php:202 Stack trace: #0 /var/www/vhosts/miosito.eu/httpdocs/vendor/symfony/symfony/src/Symfony/Component/Yaml/Parser.php(142): Symfony\Component\Yaml\Parser->doParse(Array, 0) #1 /var/www/vhosts/miosito.eu/httpdocs/src/Core/Addon/Theme/ThemeRepository.php(151): Symfony\Component\Yaml\Parser->parse('parent: classic...') #2 /var/www/vhosts/miosito.eu/httpdocs/src/Core/Addon/Theme/ThemeRepository.php(66): PrestaShop\PrestaShop\Core\Addon\Theme\ThemeRepository->getConfigFromFile('/var/www/vhosts...') #3 /var/www/vhosts/miosito.eu/httpdocs/classes/shop/Shop.php(491): PrestaShop\PrestaShop\Core\Addon\Theme\ThemeRepository->getInstanceByName('dottor') #4 /var/www/vhosts/miosito.eu/httpdocs/classes/shop/Shop.php(133): ShopCore->setTheme() #5 /var/www/vhosts/miosito.eu/httpdocs/classes/sho in /var/www/vhosts/miosito.eu/httpdocs/vendor/symfony/symfony/src/Symfony/Component/Yaml/Parser.php on line 202