#0 [internal function]: __error(8192, 'mysql_connect()...', '/var/www/vhosts...', 58, Array)
#1 system/modules/core/library/Contao/Database/Mysql.php(58): mysql_connect('localhost:3306', 'db_user', '#09tEtw6')
#2 system/modules/core/library/Contao/Database.php(77): Contao\Database\Mysql->connect()
#3 system/modules/core/library/Contao/Database.php(161): Contao\Database->__construct(Array)
#4 system/modules/pct_customelements/PCT/CustomElements/Core/PluginFactory.php(77): Contao\Database::getInstance()
#5 system/modules/pct_customelements/PCT/CustomElements/Core/PluginFactory.php(98): PCT\CustomElements\Core\PluginFactory::findAllPublished()
#6 system/modules/pct_customelements/PCT/CustomElements/Core/CustomElements.php(187): PCT\CustomElements\Core\PluginFactory::findAllPublishedWithDefinition()
#7 system/modules/pct_customelements/PCT/CustomElements/Core/CustomElements.php(91): PCT\CustomElements\Core\CustomElements->getAllowedTables()
#8 system/modules/pct_customelements/PCT/CustomElements/Loader/CustomElementsLoader.php(64): PCT\CustomElements\Core\CustomElements->getCustomElements('tl_content')
#9 system/cache/config/config.php(1098): PCT\CustomElements\Loader\CustomElementsLoader->loadFrontendModules()
#10 system/modules/core/library/Contao/Config.php(134): include('/var/www/vhosts...')
#11 system/modules/core/library/Contao/Config.php(112): Contao\Config->initialize()
#12 system/initialize.php(156): Contao\Config::getInstance()
#13 index.php(18): require('/var/www/vhosts...')
#14 {main}