Occ Call to undefined function OC\App\simplexml_load_file()

After upgrading from 18 to 19 occ is not working anymore.

sudo -u cloudks php occ

An unhandled exception has been thrown:

Error: Call to undefined function OC\App\simplexml_load_file() in /var/www/vhosts/…/httpdocs/nextcloud/lib/private/App/InfoParser.php:65

Stack trace:

#0 /var/www/vhosts/…/httpdocs/nextcloud/lib/private/App/AppManager.php(511): OC\App\InfoParser->parse()

#1 /var/www/vhosts/…/httpdocs/nextcloud/lib/private/legacy/OC_App.php(558): OC\App\AppManager->getAppInfo()

#2 /var/www/vhosts/…/httpdocs/nextcloud/lib/private/AppFramework/App.php(68): OC_App::getAppInfo()

#3 /var/www/vhosts/…/httpdocs/nextcloud/lib/private/legacy/OC_App.php(241): OC\AppFramework\App::buildAppNamespace()

#4 /var/www/vhosts/…/httpdocs/nextcloud/lib/private/legacy/OC_App.php(120): OC_App::registerAutoloading()

#5 /var/www/vhosts/…/httpdocs/nextcloud/lib/base.php(647): OC_App::loadApps()

#6 /var/www/vhosts/…/httpdocs/nextcloud/lib/base.php(1090): OC::init()

#7 /var/www/vhosts/…/httpdocs/nextcloud/console.php(49): require_once(’/var/www/vhosts…’)

#8 /var/www/vhosts/…/httpdocs/nextcloud/occ(11): require_once(’/var/www/vhosts…’)

#9 {main}

PHP Version:
PHP 7.3.19 (cli) (built: Jun 15 2020 03:25:48) ( NTS )

php -m

[PHP Modules]

apcu

bcmath

bz2

calendar

Core

ctype

curl

date

dba

dom

enchant

exif

fileinfo

filter

ftp

gd

gettext

gmp

hash

iconv

imagick

imap

intl

ionCube Loader

json

ldap

libxml

mbstring

memcached

mysqli

mysqlnd

odbc

openssl

pcntl

pcre

PDO

pdo_mysql

PDO_ODBC

pdo_pgsql

pdo_sqlite

pgsql

Phar

posix

pspell

readline

redis

Reflection

session

SimpleXML

soap

sockets

sodium

SPL

sqlite3

standard

sysvmsg

sysvsem

sysvshm

tidy

tokenizer

xml

xmlreader

xmlrpc

xmlwriter

xsl

Zend OPcache

zip

zlib

[Zend Modules]

Zend OPcache

the ionCube PHP Loader (enabled) + Intrusion Protection from ioncube24.com (unconfigured)

Try :

sudo -u cloudks php7.3 occ