Nextcloud preview generate problem

I have an problem using the preview:generate addon This process always stops at some directory. The error is unclear to me.
I hope there is some Nextcloud knowledge in this forum and someone can help me.
I start the process as:
Code:sudo -u www-data php occ preview:generate-all -vvvand this process starts well.
But the process stops with this output:
Code:2023-08-04T09:57:28+00:00 In File.php line 56:
2023-08-04T09:57:28+00:00
2023-08-04T09:57:28+00:00 [OCP\Files\GenericFileException]
2023-08-04T09:57:28+00:00
2023-08-04T09:57:28+00:00
2023-08-04T09:57:28+00:00 Exception trace:
2023-08-04T09:57:28+00:00 at /var/www/nextcloud/lib/private/Files/Node/File.php:56
2023-08-04T09:57:28+00:00 OC\Files\Node\File->getContent() at /var/www/nextcloud/lib/private/Files/SimpleFS/SimpleFile.php:74
2023-08-04T09:57:28+00:00 OC\Files\SimpleFS\SimpleFile->getContent() at /var/www/nextcloud/lib/private/Preview/GeneratorHelper.php:73
2023-08-04T09:57:28+00:00 OC\Preview\GeneratorHelper->getImage() at /var/www/nextcloud/lib/private/Preview/Generator.php:213
2023-08-04T09:57:28+00:00 OC\Preview\Generator->generatePreviews() at /var/www/nextcloud/lib/private/PreviewManager.php:212
2023-08-04T09:57:28+00:00 OC\PreviewManager->generatePreviews() at /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:230
2023-08-04T09:57:28+00:00 OCA\PreviewGenerator\Command\Generate->parseFile() at /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:212
2023-08-04T09:57:28+00:00 OCA\PreviewGenerator\Command\Generate->parseFolder() at /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:210
2023-08-04T09:57:28+00:00 OCA\PreviewGenerator\Command\Generate->parseFolder() at /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:210
2023-08-04T09:57:28+00:00 OCA\PreviewGenerator\Command\Generate->parseFolder() at /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:210
2023-08-04T09:57:28+00:00 OCA\PreviewGenerator\Command\Generate->parseFolder() at /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:210
2023-08-04T09:57:28+00:00 OCA\PreviewGenerator\Command\Generate->parseFolder() at /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:190
2023-08-04T09:57:28+00:00 OCA\PreviewGenerator\Command\Generate->generateUserPreviews() at /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:136
2023-08-04T09:57:28+00:00 OCA\PreviewGenerator\Command\Generate->OCA\PreviewGenerator\Command\{closure}() at /var/www/nextcloud/lib/private/User/Manager.php:632
2023-08-04T09:57:28+00:00 OC\User\Manager->callForSeenUsers() at /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php:135
2023-08-04T09:57:28+00:00 OCA\PreviewGenerator\Command\Generate->execute() at /var/www/nextcloud/3rdparty/symfony/console/Command/Command.php:298
2023-08-04T09:57:28+00:00 Symfony\Component\Console\Command\Command->run() at /var/www/nextcloud/3rdparty/symfony/console/Application.php:1040
2023-08-04T09:57:28+00:00 Symfony\Component\Console\Application->doRunCommand() at /var/www/nextcloud/3rdparty/symfony/console/Application.php:301
2023-08-04T09:57:28+00:00 Symfony\Component\Console\Application->doRun() at /var/www/nextcloud/3rdparty/symfony/console/Application.php:171
2023-08-04T09:57:28+00:00 Symfony\Component\Console\Application->run() at /var/www/nextcloud/lib/private/Console/Application.php:211
2023-08-04T09:57:28+00:00 OC\Console\Application->run() at /var/www/nextcloud/console.php:100
2023-08-04T09:57:28+00:00 require_once() at /var/www/nextcloud/occ:11
2023-08-04T09:57:28+00:00
2023-08-04T09:57:28+00:00 preview:generate-all [-p|--path [PATH]] [--] [<user_id>...]I'm running Ubuntu server 22.04. With native Nextcloud on Apache2 and php-fpm 8.2.

I Deactivate App, Uninstall the preview App, and Installed the App again and executed:
Code:sudo -u www-data php occ files:scan-app-datawithout errors.
Does anyone know how to debug this and find an solution?