The plugin class "con4gis\CoreBundle\ContaoManager\Plugin" was not found

Ahoi liebe Forenwesen,

ich wollte mal wieder eine Contao Installation updaten (4.13.6) über den Contao-Manager (1.6.2), allerdings hängt er bei jedem Update-Versuch fest. Egal ob ich ein Composer-Update ausführe oder nur einen bestimmten Teil updaten will. Folgende Ausgabe:

Code:

---

composer update --no-install
$ /opt/plesk/php/7.4/bin/php -q -dmax_execution_time=0 -dmemory_limit=-1 -ddisplay_errors=0 -ddisplay_startup_errors=0 -derror_reporting=0 -dallow_url_fopen=1 -ddisable_functions= -ddate.timezone=UTC /var/www/vhosts/WEBSITE.de/httpdocs/WEBSITE.de/web/contao-manager.phar.php composer update --with-dependencies --no-install --no-scripts --no-dev --no-progress --no-ansi --no-interaction --optimize-autoloader
Loading composer repositories with package information
Updating dependencies
contao/manager-plugin: Dumping generated plugins file...
Lock file operations: 1 install, 127 updates, 2 removals
  - Removing webmozart/assert (1.11.0)
  - Removing webmozart/path-util (2.3.0)
  - Upgrading bacon/bacon-qr-code (2.0.7 => 2.0.8)
  - Upgrading codefog/contao-haste (4.25.20 => 4.25.23)
  - Upgrading composer/ca-bundle (1.3.3 => 1.3.5)
  - Upgrading con4gis/core (v6.0.11 => v6.0.19)
  - Upgrading contao-components/ace (1.8.0 => 1.14.0)
  - Upgrading contao-components/chosen (1.2.4 => 1.2.5)
  - Upgrading contao-components/contao (9.2.0 => 9.3.2)
  - Upgrading contao-components/jquery (3.6.0 => 3.6.3)
  - Upgrading contao-components/jquery-ui (1.13.1 => 1.13.2)
  - Upgrading contao-components/mootools (1.6.0.6 => 1.6.0.7)
  - Upgrading contao-components/tinymce4 (5.10.5 => 5.10.7)
  - Upgrading contao/calendar-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/comments-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/conflicts (dev-main 499c1af => dev-main 2d8ba56)
  - Upgrading contao/core-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/faq-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/image (1.1.1 => 1.1.2)
  - Upgrading contao/installation-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/listing-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/manager-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/manager-plugin (2.12.0 2f43a7d => 2.12.0 381dcb7)
  - Upgrading contao/news-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/newsletter-bundle (4.13.6 => 4.13.15)
  - Upgrading dflydev/dot-access-data (v3.0.1 => v3.0.2)
  - Upgrading doctrine/annotations (1.13.3 => 1.14.2)
  - Upgrading doctrine/collections (1.6.8 => 1.8.0)
  - Upgrading doctrine/common (3.3.0 => 3.4.3)
  - Upgrading doctrine/data-fixtures (1.5.3 => 1.6.3)
  - Upgrading doctrine/dbal (3.3.7 => 3.5.3)
  - Upgrading doctrine/doctrine-bundle (2.7.0 => 2.8.2)
  - Upgrading doctrine/event-manager (1.1.1 => 1.2.0)
  - Upgrading doctrine/inflector (2.0.4 => 2.0.6)
  - Upgrading doctrine/instantiator (1.4.1 => 1.5.0)
  - Upgrading doctrine/lexer (1.2.3 => 2.1.0)
  - Upgrading doctrine/orm (2.12.3 => 2.14.1)
  - Upgrading doctrine/persistence (2.5.3 => 2.5.6)
  - Upgrading egulias/email-validator (3.2.1 => 3.2.5)
  - Upgrading fgrosse/phpasn1 (v2.4.0 => v2.5.0)
  - Upgrading friendsofphp/proxy-manager-lts (v1.0.12 => v1.0.13)
  - Upgrading friendsofsymfony/http-cache (2.14.1 => 2.15.0)
  - Upgrading friendsofsymfony/http-cache-bundle (2.12.1 => 2.14.0)
  - Upgrading guzzlehttp/guzzle (6.5.8 => 7.5.0)
  - Upgrading guzzlehttp/promises (1.5.1 => 1.5.2)
  - Upgrading guzzlehttp/psr7 (1.9.0 => 2.4.3)
  - Upgrading imagine/imagine (1.3.2 => 1.3.3)
  - Upgrading knplabs/knp-time-bundle (v1.19.0 => v1.20.0)
  - Upgrading laminas/laminas-code (4.5.2 => 4.7.1)
  - Upgrading league/commonmark (2.3.4 => 2.3.8)
  - Upgrading league/config (v1.1.1 => v1.2.0)
  - Upgrading league/flysystem (2.4.5 => 2.5.0)
  - Upgrading league/flysystem-bundle (2.2.1 => 2.4.0)
  - Upgrading madeyourday/contao-rocksolid-columns (v2.0.3 => v2.1.1)
  - Upgrading madeyourday/contao-rocksolid-custom-elements (v2.3.12 => v2.4.2)
  - Upgrading madeyourday/contao-rocksolid-frontend-helper (v2.1.4 => v2.2.0)
  - Upgrading madeyourday/contao-rocksolid-icon-picker (v2.0.3 => v2.1.0)
  - Upgrading madeyourday/contao-rocksolid-mega-menu (v2.1.4 => v2.2.2)
  - Upgrading madeyourday/contao-rocksolid-slider (v2.1.8 => v2.2.2)
  - Upgrading madeyourday/contao-rocksolid-theme-assistant (v2.0.5 => v2.1.0)
  - Upgrading matthiasmullie/minify (1.3.68 => 1.3.70)
  - Upgrading monolog/monolog (2.7.0 => 2.8.0)
  - Upgrading nette/schema (v1.2.2 => v1.2.3)
  - Upgrading nette/utils (v3.2.7 => v3.2.9)
  - Upgrading nikic/php-parser (v4.14.0 => v4.15.3)
  - Upgrading oneup/contao-mailchimp (4.5.0 => 4.7.1)
  - Upgrading oneup/mailchimp-api-v3 (2.5.0 => 2.7.0)
  - Upgrading php-http/client-common (2.5.0 => 2.6.0)
  - Upgrading scrivo/highlight.php (v9.18.1.9 => v9.18.1.10)
  - Upgrading scssphp/scssphp (v1.10.3 => v1.11.0)
  - Upgrading simplepie/simplepie (1.6.0 => 1.8.0)
  - Upgrading symfony/asset (v5.4.7 => v5.4.13)
  - Upgrading symfony/cache (v5.4.10 => v5.4.18)
  - Upgrading symfony/config (v5.4.9 => v5.4.11)
  - Upgrading symfony/console (v5.4.10 => v5.4.17)
  - Upgrading symfony/debug-bundle (v5.4.3 => v5.4.11)
  - Upgrading symfony/dependency-injection (v5.4.10 => v5.4.17)
  - Upgrading symfony/doctrine-bridge (v5.4.10 => v5.4.17)
  - Upgrading symfony/dom-crawler (v5.4.9 => v5.4.17)
  - Upgrading symfony/error-handler (v5.4.9 => v5.4.17)
  - Upgrading symfony/event-dispatcher (v5.4.9 => v5.4.17)
  - Upgrading symfony/expression-language (v5.4.10 => v5.4.14)
  - Upgrading symfony/filesystem (v5.4.9 => v5.4.13)
  - Upgrading symfony/finder (v5.4.8 => v5.4.17)
  - Upgrading symfony/framework-bundle (v5.4.10 => v5.4.17)
  - Upgrading symfony/http-client (v5.4.9 => v5.4.17)
  - Upgrading symfony/http-foundation (v5.4.10 => v5.4.17)
  - Upgrading symfony/http-kernel (v5.4.10 => v5.4.18)
  - Upgrading symfony/intl (v5.4.10 => v5.4.15)
  - Upgrading symfony/lock (v5.4.10 => v5.4.15)
  - Upgrading symfony/mailer (v5.4.10 => v5.4.17)
  - Upgrading symfony/mime (v5.4.10 => v5.4.17)
  - Upgrading symfony/monolog-bridge (v5.4.10 => v5.4.17)
  - Upgrading symfony/options-resolver (v5.4.3 => v5.4.11)
  - Upgrading symfony/password-hasher (v5.4.8 => v5.4.11)
  - Upgrading symfony/polyfill-ctype (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-intl-grapheme (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-intl-idn (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-intl-normalizer (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-mbstring (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-php72 (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-php73 (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-php80 (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-php81 (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-uuid (v1.26.0 => v1.27.0)
  - Upgrading symfony/process (v5.4.8 => v5.4.11)
  - Upgrading symfony/property-access (v5.4.8 => v5.4.15)
  - Upgrading symfony/property-info (v5.4.10 => v5.4.17)
  - Upgrading symfony/routing (v5.4.8 => v5.4.17)
  - Upgrading symfony/security-bundle (v5.4.9 => v5.4.17)
  - Upgrading symfony/security-core (v5.4.10 => v5.4.15)
  - Upgrading symfony/security-csrf (v5.4.9 => v5.4.11)
  - Upgrading symfony/security-guard (v5.4.9 => v5.4.13)
  - Upgrading symfony/security-http (v5.4.10 => v5.4.17)
  - Upgrading symfony/stopwatch (v5.4.5 => v5.4.13)
  - Upgrading symfony/string (v5.4.10 => v5.4.17)
  - Locking symfony/templating (v5.4.11)
  - Upgrading symfony/translation (v5.4.9 => v5.4.14)
  - Upgrading symfony/twig-bridge (v5.4.9 => v5.4.17)
  - Upgrading symfony/twig-bundle (v5.4.8 => v5.4.17)
  - Upgrading symfony/uid (v5.4.3 => v5.4.13)
  - Upgrading symfony/var-dumper (v5.4.9 => v5.4.17)
  - Upgrading symfony/var-exporter (v5.4.10 => v5.4.17)
  - Upgrading symfony/web-profiler-bundle (v5.4.10 => v5.4.17)
  - Upgrading symfony/yaml (v5.4.10 => v5.4.17)
  - Upgrading terminal42/escargot (1.4.1 => 1.5.1)
  - Upgrading terminal42/notification_center (1.6.13 => 1.6.14)
  - Upgrading terminal42/service-annotation-bundle (1.1.3 => 1.1.4)
  - Upgrading twig/extra-bundle (v3.4.0 => v3.5.0)
  - Upgrading twig/twig (v3.4.1 => v3.5.0)
Writing lock file
Package fgrosse/phpasn1 is abandoned, you should avoid using it. No replacement was suggested.
Package patchwork/utf8 is abandoned, you should avoid using it. Use symfony/polyfill-mbstring or symfony/string instead.
117 packages you are using are looking for funding.
Use the `composer fund` command to find out more!
In ManagerPluginInstaller.php line 112:
                                                                           
  The plugin class "con4gis\CoreBundle\ContaoManager\Plugin" was not found. 
                                                                           
update [--with WITH] [--prefer-source] [--prefer-dist] [--prefer-install PREFER-INSTALL] [--dry-run] [--dev] [--no-dev] [--lock] [--no-install] [--no-autoloader] [--no-suggest] [--no-progress] [-w|--with-dependencies] [-W|--with-all-dependencies] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--apcu-autoloader-prefix APCU-AUTOLOADER-PREFIX] [--ignore-platform-req IGNORE-PLATFORM-REQ] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [-i|--interactive] [--root-reqs] [--] [<packages>...]
# Process terminated with exit code 1
# Result: General error

vendor/bin/contao-console contao:maintenance-mode enable
composer install
vendor/bin/contao-console contao:maintenance-mode disable

---

Ich dachte ich versuche es mit deinstallieren / entfernen vom PWA-Plugin, aber gleiche Fehlermeldung bei Composer. Was kann ich tun? Autodump / Cache leeren / alle Optionen habe ich schon durchprobiert.

Poste deine composer.json

Code:

---

{
    "type": "project",
    "require": {
        "con4gis/pwa": "^2.4",
        "contao/calendar-bundle": "^4.13",
        "contao/comments-bundle": "^4.13",
        "contao/conflicts": "*@dev",
        "contao/faq-bundle": "^4.13",
        "contao/listing-bundle": "^4.13",
        "contao/manager-bundle": "4.13.*",
        "contao/news-bundle": "^4.13",
        "contao/newsletter-bundle": "^4.13",
        "delahaye/dlh_googlemaps": "^2.4",
        "dieschittigs/contao-recaptcha": "^1.2",
        "madeyourday/contao-rocksolid-columns": "^2.0",
        "madeyourday/contao-rocksolid-custom-elements": "^2.2",
        "madeyourday/contao-rocksolid-frontend-helper": "^2.0",
        "madeyourday/contao-rocksolid-icon-picker": "^2.0",
        "madeyourday/contao-rocksolid-mega-menu": "^2.0",
        "madeyourday/contao-rocksolid-slider": "^2.0",
        "madeyourday/contao-rocksolid-theme-assistant": "^2.0",
        "oneup/contao-mailchimp": "^4.4",
        "terminal42/notification_center": "^1.5"
    },
    "extra": {
        "contao-component-dir": "assets"
    },
    "scripts": {
        "post-install-cmd": [
            "Contao\\ManagerBundle\\Composer\\ScriptHandler::initializeApplication"
        ],
        "post-update-cmd": [
            "Contao\\ManagerBundle\\Composer\\ScriptHandler::initializeApplication"
        ]
    }
}

---

In Deiner composer.json ist aber con4gis/pwa noch enthalten und dafür wird der con4gis/core benötigt.
Lösche con4gis/pwa manuell aus der composer.json und führe über die Systemwartung im Manager composer update aus.

Leider gleiche Fehlermeldung. Ich bin mir nicht sicher, warum der Fehler überhaupt eintritt? Ich glaube zuletzt bei Contao Manager v1.5.7 geupdated zu haben das letzte Mal.

Poste die composer.json

Naja, es ist die gleiche nur ohne con4gis/pwa, dennoch gleiche Fehlermeldung:

Code:

---

{
    "type": "project",
    "require": {
        "contao/calendar-bundle": "^4.13",
        "contao/comments-bundle": "^4.13",
        "contao/conflicts": "*@dev",
        "contao/faq-bundle": "^4.13",
        "contao/listing-bundle": "^4.13",
        "contao/manager-bundle": "4.13.*",
        "contao/news-bundle": "^4.13",
        "contao/newsletter-bundle": "^4.13",
        "delahaye/dlh_googlemaps": "^2.4",
        "dieschittigs/contao-recaptcha": "^1.2",
        "madeyourday/contao-rocksolid-columns": "^2.0",
        "madeyourday/contao-rocksolid-custom-elements": "^2.2",
        "madeyourday/contao-rocksolid-frontend-helper": "^2.0",
        "madeyourday/contao-rocksolid-icon-picker": "^2.0",
        "madeyourday/contao-rocksolid-mega-menu": "^2.0",
        "madeyourday/contao-rocksolid-slider": "^2.0",
        "madeyourday/contao-rocksolid-theme-assistant": "^2.0",
        "oneup/contao-mailchimp": "^4.4",
        "terminal42/notification_center": "^1.5"
    },
    "extra": {
        "contao-component-dir": "assets"
    },
    "scripts": {
        "post-install-cmd": [
            "Contao\\ManagerBundle\\Composer\\ScriptHandler::initializeApplication"
        ],
        "post-update-cmd": [
            "Contao\\ManagerBundle\\Composer\\ScriptHandler::initializeApplication"
        ]
    }
}

---

EDIT: Für den Fall, dass ich etwas verhunzt habe, habe ich das Backup erneut eingespielt, die Zeile aus der composer.json entfernt, den Contao-Manager aufgerufen, über die Systemwartung Composer Update -> gleiche Fehlermeldung.

Poste die Konsolenausgabe.

Ähnlich wie im ersten Post:

Code:

---

$ /opt/plesk/php/7.4/bin/php -q -dmax_execution_time=0 -dmemory_limit=-1 -ddisplay_errors=0 -ddisplay_startup_errors=0 -derror_reporting=0 -dallow_url_fopen=1 -ddisable_functions= -ddate.timezone=UTC /var/www/vhosts/WEBSITE.de/httpdocs/WEBSITE.de/web/contao-manager.phar.php composer update --with-dependencies --no-install --no-scripts --no-dev --no-progress --no-ansi --no-interaction --optimize-autoloader
Loading composer repositories with package information
Info from https://repo.packagist.org: #StandWithUkraine
Updating dependencies
contao/manager-plugin: Dumping generated plugins file...
Lock file operations: 1 install, 126 updates, 15 removals
  - Removing brick/math (0.9.3)
  - Removing con4gis/core (v6.0.11)
  - Removing con4gis/pwa (v2.4.1)
  - Removing doctrine/data-fixtures (1.5.3)
  - Removing fgrosse/phpasn1 (v2.4.0)
  - Removing minishlink/web-push (v7.0.0)
  - Removing minishlink/web-push-bundle (v6.0.3)
  - Removing spomky-labs/base64url (v2.0.4)
  - Removing web-token/jwt-core (v2.2.11)
  - Removing web-token/jwt-key-mgmt (v2.2.11)
  - Removing web-token/jwt-signature (v2.2.11)
  - Removing web-token/jwt-signature-algorithm-ecdsa (v2.2.11)
  - Removing web-token/jwt-util-ecc (v2.2.11)
  - Removing webmozart/assert (1.11.0)
  - Removing webmozart/path-util (2.3.0)
  - Upgrading bacon/bacon-qr-code (2.0.7 => 2.0.8)
  - Upgrading codefog/contao-haste (4.25.20 => 4.25.23)
  - Upgrading composer/ca-bundle (1.3.3 => 1.3.5)
  - Upgrading contao-components/ace (1.8.0 => 1.14.0)
  - Upgrading contao-components/chosen (1.2.4 => 1.2.5)
  - Upgrading contao-components/contao (9.2.0 => 9.3.2)
  - Upgrading contao-components/jquery (3.6.0 => 3.6.3)
  - Upgrading contao-components/jquery-ui (1.13.1 => 1.13.2)
  - Upgrading contao-components/mootools (1.6.0.6 => 1.6.0.7)
  - Upgrading contao-components/tinymce4 (5.10.5 => 5.10.7)
  - Upgrading contao/calendar-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/comments-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/conflicts (dev-main 499c1af => dev-main 2d8ba56)
  - Upgrading contao/core-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/faq-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/image (1.1.1 => 1.1.2)
  - Upgrading contao/installation-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/listing-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/manager-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/manager-plugin (2.12.0 2f43a7d => 2.12.0 381dcb7)
  - Upgrading contao/news-bundle (4.13.6 => 4.13.15)
  - Upgrading contao/newsletter-bundle (4.13.6 => 4.13.15)
  - Upgrading dflydev/dot-access-data (v3.0.1 => v3.0.2)
  - Upgrading doctrine/annotations (1.13.3 => 1.14.2)
  - Upgrading doctrine/collections (1.6.8 => 1.8.0)
  - Upgrading doctrine/common (3.3.0 => 3.4.3)
  - Upgrading doctrine/dbal (3.3.7 => 3.5.3)
  - Upgrading doctrine/doctrine-bundle (2.7.0 => 2.8.2)
  - Upgrading doctrine/event-manager (1.1.1 => 1.2.0)
  - Upgrading doctrine/inflector (2.0.4 => 2.0.6)
  - Upgrading doctrine/instantiator (1.4.1 => 1.5.0)
  - Upgrading doctrine/lexer (1.2.3 => 2.1.0)
  - Upgrading doctrine/orm (2.12.3 => 2.14.1)
  - Upgrading doctrine/persistence (2.5.3 => 2.5.6)
  - Upgrading egulias/email-validator (3.2.1 => 3.2.5)
  - Upgrading friendsofphp/proxy-manager-lts (v1.0.12 => v1.0.13)
  - Upgrading friendsofsymfony/http-cache (2.14.1 => 2.15.0)
  - Upgrading friendsofsymfony/http-cache-bundle (2.12.1 => 2.14.0)
  - Upgrading guzzlehttp/guzzle (6.5.8 => 7.5.0)
  - Upgrading guzzlehttp/promises (1.5.1 => 1.5.2)
  - Upgrading guzzlehttp/psr7 (1.9.0 => 2.4.3)
  - Upgrading imagine/imagine (1.3.2 => 1.3.3)
  - Upgrading knplabs/knp-time-bundle (v1.19.0 => v1.20.0)
  - Upgrading laminas/laminas-code (4.5.2 => 4.7.1)
  - Upgrading league/commonmark (2.3.4 => 2.3.8)
  - Upgrading league/config (v1.1.1 => v1.2.0)
  - Upgrading league/flysystem (2.4.5 => 2.5.0)
  - Upgrading league/flysystem-bundle (2.2.1 => 2.4.0)
  - Upgrading madeyourday/contao-rocksolid-columns (v2.0.3 => v2.1.1)
  - Upgrading madeyourday/contao-rocksolid-custom-elements (v2.3.12 => v2.4.2)
  - Upgrading madeyourday/contao-rocksolid-frontend-helper (v2.1.4 => v2.2.0)
  - Upgrading madeyourday/contao-rocksolid-icon-picker (v2.0.3 => v2.1.0)
  - Upgrading madeyourday/contao-rocksolid-mega-menu (v2.1.4 => v2.2.2)
  - Upgrading madeyourday/contao-rocksolid-slider (v2.1.8 => v2.2.2)
  - Upgrading madeyourday/contao-rocksolid-theme-assistant (v2.0.5 => v2.1.0)
  - Upgrading matthiasmullie/minify (1.3.68 => 1.3.70)
  - Upgrading monolog/monolog (2.7.0 => 2.8.0)
  - Upgrading nette/schema (v1.2.2 => v1.2.3)
  - Upgrading nette/utils (v3.2.7 => v3.2.9)
  - Upgrading nikic/php-parser (v4.14.0 => v4.15.3)
  - Upgrading oneup/contao-mailchimp (4.5.0 => 4.7.1)
  - Upgrading oneup/mailchimp-api-v3 (2.5.0 => 2.7.0)
  - Upgrading php-http/client-common (2.5.0 => 2.6.0)
  - Upgrading scrivo/highlight.php (v9.18.1.9 => v9.18.1.10)
  - Upgrading scssphp/scssphp (v1.10.3 => v1.11.0)
  - Upgrading simplepie/simplepie (1.6.0 => 1.8.0)
  - Upgrading symfony/asset (v5.4.7 => v5.4.19)
  - Upgrading symfony/cache (v5.4.10 => v5.4.19)
  - Upgrading symfony/config (v5.4.9 => v5.4.19)
  - Upgrading symfony/console (v5.4.10 => v5.4.19)
  - Upgrading symfony/debug-bundle (v5.4.3 => v5.4.19)
  - Upgrading symfony/dependency-injection (v5.4.10 => v5.4.19)
  - Upgrading symfony/doctrine-bridge (v5.4.10 => v5.4.19)
  - Upgrading symfony/dom-crawler (v5.4.9 => v5.4.19)
  - Upgrading symfony/dotenv (v5.4.5 => v5.4.19)
  - Upgrading symfony/error-handler (v5.4.9 => v5.4.19)
  - Upgrading symfony/event-dispatcher (v5.4.9 => v5.4.19)
  - Upgrading symfony/expression-language (v5.4.10 => v5.4.19)
  - Upgrading symfony/filesystem (v5.4.9 => v5.4.19)
  - Upgrading symfony/finder (v5.4.8 => v5.4.19)
  - Upgrading symfony/framework-bundle (v5.4.10 => v5.4.19)
  - Upgrading symfony/http-client (v5.4.9 => v5.4.19)
  - Upgrading symfony/http-foundation (v5.4.10 => v5.4.19)
  - Upgrading symfony/http-kernel (v5.4.10 => v5.4.19)
  - Upgrading symfony/intl (v5.4.10 => v5.4.19)
  - Upgrading symfony/lock (v5.4.10 => v5.4.19)
  - Upgrading symfony/mailer (v5.4.10 => v5.4.19)
  - Upgrading symfony/mime (v5.4.10 => v5.4.19)
  - Upgrading symfony/monolog-bridge (v5.4.10 => v5.4.19)
  - Upgrading symfony/options-resolver (v5.4.3 => v5.4.19)
  - Upgrading symfony/password-hasher (v5.4.8 => v5.4.19)
  - Upgrading symfony/polyfill-ctype (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-intl-grapheme (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-intl-idn (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-intl-normalizer (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-mbstring (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-php72 (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-php73 (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-php80 (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-php81 (v1.26.0 => v1.27.0)
  - Upgrading symfony/polyfill-uuid (v1.26.0 => v1.27.0)
  - Upgrading symfony/process (v5.4.8 => v5.4.19)
  - Upgrading symfony/property-access (v5.4.8 => v5.4.19)
  - Upgrading symfony/property-info (v5.4.10 => v5.4.19)
  - Upgrading symfony/proxy-manager-bridge (v5.4.6 => v5.4.19)
  - Upgrading symfony/routing (v5.4.8 => v5.4.19)
  - Upgrading symfony/security-bundle (v5.4.9 => v5.4.19)
  - Upgrading symfony/security-core (v5.4.10 => v5.4.19)
  - Upgrading symfony/security-csrf (v5.4.9 => v5.4.19)
  - Upgrading symfony/security-guard (v5.4.9 => v5.4.19)
  - Upgrading symfony/security-http (v5.4.10 => v5.4.19)
  - Upgrading symfony/stopwatch (v5.4.5 => v5.4.19)
  - Upgrading symfony/string (v5.4.10 => v5.4.19)
  - Locking symfony/templating (v5.4.19)
  - Upgrading symfony/translation (v5.4.9 => v5.4.19)
  - Upgrading symfony/twig-bridge (v5.4.9 => v5.4.19)
  - Upgrading symfony/twig-bundle (v5.4.8 => v5.4.19)
  - Upgrading symfony/uid (v5.4.3 => v5.4.19)
  - Upgrading symfony/var-dumper (v5.4.9 => v5.4.19)
  - Upgrading symfony/var-exporter (v5.4.10 => v5.4.19)
  - Upgrading symfony/web-profiler-bundle (v5.4.10 => v5.4.19)
  - Upgrading symfony/yaml (v5.4.10 => v5.4.19)
  - Upgrading terminal42/escargot (1.4.1 => 1.5.1)
  - Upgrading terminal42/notification_center (1.6.13 => 1.6.14)
  - Upgrading terminal42/service-annotation-bundle (1.1.3 => 1.1.4)
  - Upgrading twig/extra-bundle (v3.4.0 => v3.5.0)
  - Upgrading twig/twig (v3.4.1 => v3.5.0)
Writing lock file
Package patchwork/utf8 is abandoned, you should avoid using it. Use symfony/polyfill-mbstring or symfony/string instead.
117 packages you are using are looking for funding.
Use the `composer fund` command to find out more!
In ManagerPluginInstaller.php line 112:
                                                                           
  The plugin class "con4gis\CoreBundle\ContaoManager\Plugin" was not found. 
                                                                           
update [--with WITH] [--prefer-source] [--prefer-dist] [--prefer-install PREFER-INSTALL] [--dry-run] [--dev] [--no-dev] [--lock] [--no-install] [--no-autoloader] [--no-suggest] [--no-progress] [-w|--with-dependencies] [-W|--with-all-dependencies] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--apcu-autoloader-prefix APCU-AUTOLOADER-PREFIX] [--ignore-platform-req IGNORE-PLATFORM-REQ] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [-i|--interactive] [--root-reqs] [--] [<packages>...]
# Process terminated with exit code 1
# Result: General error

---

Hm, lösche mal vendor/contao/manager-plugin, dann wieder "Composer Update ausführen" über die Systemwartung.

Das- hat funktioniert. Irgendein Grund für das Verhalten? Auf jeden Fall danke schonmal!