error backup

Hello,
I am using the latest version of CNP and when I start a backup with nc-backup, I get the following error.
Thank you in advance for your help

Installing template 'ncp-metrics.cfg.sh'...
check free space...
An unhandled exception has been thrown:
Doctrine\DBAL\Exception: Failed to connect to the database: An exception occurred in the driver: could not find driver in /var/www/nextcloud/lib/private/DB/Connection.php:146
Stack trace:
#0 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1654): OC\DB\Connection->connect()
#1 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1081): Doctrine\DBAL\Connection->getWrappedConnection()
#2 /var/www/nextcloud/lib/private/DB/Connection.php(266): Doctrine\DBAL\Connection->executeQuery()
#3 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php(337): OC\DB\Connection->executeQuery()
#4 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php(377): Doctrine\DBAL\Query\QueryBuilder->executeQuery()
#5 /var/www/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php(280): Doctrine\DBAL\Query\QueryBuilder->execute()
#6 /var/www/nextcloud/lib/private/AppConfig.php(421): OC\DB\QueryBuilder\QueryBuilder->execute()
#7 /var/www/nextcloud/lib/private/AppConfig.php(187): OC\AppConfig->loadConfigValues()
#8 /var/www/nextcloud/lib/private/AppConfig.php(377): OC\AppConfig->getApps()
#9 /var/www/nextcloud/lib/private/App/AppManager.php(128): OC\AppConfig->getValues()
#10 /var/www/nextcloud/lib/private/App/AppManager.php(149): OC\App\AppManager->getInstalledAppsValues()
#11 /var/www/nextcloud/lib/private/legacy/OC_App.php(231): OC\App\AppManager->getInstalledApps()
#12 /var/www/nextcloud/lib/private/AppFramework/Bootstrap/Coordinator.php(90): OC_App::getEnabledApps()
#13 /var/www/nextcloud/lib/base.php(700): OC\AppFramework\Bootstrap\Coordinator->runInitialRegistration()
#14 /var/www/nextcloud/lib/base.php(1200): OC::init()
#15 /var/www/nextcloud/console.php(48): require_once('...')
#16 /var/www/nextcloud/occ(11): require_once('...')
#17 {main}Abort...
An unhandled exception has been thrown:
Doctrine\DBAL\Exception: Failed to connect to the database: An exception occurred in the driver: could not find driver in /var/www/nextcloud/lib/private/DB/Connection.php:146
Stack trace:
#0 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1654): OC\DB\Connection->connect()
#1 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1081): Doctrine\DBAL\Connection->getWrappedConnection()
#2 /var/www/nextcloud/lib/private/DB/Connection.php(266): Doctrine\DBAL\Connection->executeQuery()
#3 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php(337): OC\DB\Connection->executeQuery()
#4 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php(377): Doctrine\DBAL\Query\QueryBuilder->executeQuery()
#5 /var/www/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php(280): Doctrine\DBAL\Query\QueryBuilder->execute()
#6 /var/www/nextcloud/lib/private/AppConfig.php(421): OC\DB\QueryBuilder\QueryBuilder->execute()
#7 /var/www/nextcloud/lib/private/AppConfig.php(187): OC\AppConfig->loadConfigValues()
#8 /var/www/nextcloud/lib/private/AppConfig.php(377): OC\AppConfig->getApps()
#9 /var/www/nextcloud/lib/private/App/AppManager.php(128): OC\AppConfig->getValues()
#10 /var/www/nextcloud/lib/private/App/AppManager.php(149): OC\App\AppManager->getInstalledAppsValues()
#11 /var/www/nextcloud/lib/private/legacy/OC_App.php(231): OC\App\AppManager->getInstalledApps()
#12 /var/www/nextcloud/lib/private/AppFramework/Bootstrap/Coordinator.php(90): OC_App::getEnabledApps()
#13 /var/www/nextcloud/lib/base.php(700): OC\AppFramework\Bootstrap\Coordinator->runInitialRegistration()
#14 /var/www/nextcloud/lib/base.php(1200): OC::init()
#15 /var/www/nextcloud/console.php(48): require_once('...')
#16 /var/www/nextcloud/occ(11): require_once('...')
#17 {main}
An unhandled exception has been thrown:
Doctrine\DBAL\Exception: Failed to connect to the database: An exception occurred in the driver: could not find driver in /var/www/nextcloud/lib/private/DB/Connection.php:146
Stack trace:
#0 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1654): OC\DB\Connection->connect()
#1 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1081): Doctrine\DBAL\Connection->getWrappedConnection()
#2 /var/www/nextcloud/lib/private/DB/Connection.php(266): Doctrine\DBAL\Connection->executeQuery()
#3 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php(337): OC\DB\Connection->executeQuery()
#4 /var/www/nextcloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php(377): Doctrine\DBAL\Query\QueryBuilder->executeQuery()
#5 /var/www/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php(280): Doctrine\DBAL\Query\QueryBuilder->execute()
#6 /var/www/nextcloud/lib/private/AppConfig.php(421): OC\DB\QueryBuilder\QueryBuilder->execute()
#7 /var/www/nextcloud/lib/private/AppConfig.php(187): OC\AppConfig->loadConfigValues()
#8 /var/www/nextcloud/lib/private/AppConfig.php(377): OC\AppConfig->getApps()
#9 /var/www/nextcloud/lib/private/App/AppManager.php(128): OC\AppConfig->getValues()
#10 /var/www/nextcloud/lib/private/App/AppManager.php(149): OC\App\AppManager->getInstalledAppsValues()
#11 /var/www/nextcloud/lib/private/legacy/OC_App.php(231): OC\App\AppManager->getInstalledApps()
#12 /var/www/nextcloud/lib/private/AppFramework/Bootstrap/Coordinator.php(90): OC_App::getEnabledApps()
#13 /var/www/nextcloud/lib/base.php(700): OC\AppFramework\Bootstrap\Coordinator->runInitialRegistration()
#14 /var/www/nextcloud/lib/base.php(1200): OC::init()
#15 /var/www/nextcloud/console.php(48): require_once('...')
#16 /var/www/nextcloud/occ(11): require_once('...')
#17 {main}

Start at the nc-backup command and the reported failure in /var/www/nextcloud/lib/private/DB/Connection.php, then trace how it invokes /var/www/nextcloud/occ. Reproduce the backup and determine why the database driver is unavailable; done means the backup starts without the reported Doctrine exception.