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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 22.2.3
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04
Apache or nginx version (eg, Apache 2.4.25): Nginx 1.18
PHP version (eg, 7.4): 8.0.13
Db : psql 13.5
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): n (Same error on 21.X.X)
Steps to replicate it:
- sudo -u USER1 php /var/www/nextcloud/occ files:scan USER
- Full scan ok
- Always same Error at end of scan
The output of your Nextcloud log in Admin > Logging:
RuntimeException: File entry could not be inserted but could also not be selected with getId() in order to perform an update. Please try again.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => '************',
'passwordsalt' => '*********',
'secret' => '*****************',
'default_phone_region' => 'FR',
'trusted_domains' =>
array (
0 => 'MYWEBSERVER',
1 => 'MYWEBSERVER.local',
),
'datadirectory' => 'SOMEWHERE',
'dbtype' => 'pgsql',
'version' => '22.2.3.0',
'overwrite.cli.url' => 'https://MYWEBSERVER',
'dbname' => 'NameDb',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'UserDb',
'dbpassword' => 'PassDb',
'installed' => true,
'filelocking.enabled' => 'true',
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis.sock',
'port' => '0',
),
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'app_install_overwrite' =>
array (
0 => 'previewgenerator',
),
'preview_max_x' => '2048',
'preview_max_y' => '2048',
'jpeg_quality' => '60',
'filesystem_check_changes' => 0,
'maintenance' => false,
'theme' => '',
'loglevel' => 1,
'log_type' => 'file',
'logfile' => '/var/log/nextcloud/nextcloud.log',
'logtimezone' => 'Europe/Paris',
'log_rotate_size' => '104857600'
);
The output of your Apache/nginx/system log in /var/log/____:
{"reqId":"YkmKaFQJhcwlNWtJAOWc","level":3,"time":"2021-12-06T09:10:02+01:00","remoteAddr":"","user":"--","app":"files","method":"","url":"--","message":"File entry could not be inserted but could also not be selected with getId() in order to perform an update. Please try again.","userAgent":"--","version":"22.2.3.0","exception":{"Exception":"RuntimeException","Message":"File entry could not be inserted but could also not be selected with getId() in order to perform an update. Please try again.","Code":0,"Trace":[{"file":"/var/www/nextcloud/lib/private/Files/Cache/Wrapper/CacheWrapper.php","line":135,"function":"insert","class":"OC\\Files\\Cache\\Cache","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Cache/Scanner.php","line":294,"function":"insert","class":"OC\\Files\\Cache\\Wrapper\\CacheWrapper","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Cache/Scanner.php","line":224,"function":"addToCache","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Cache/Scanner.php","line":427,"function":"scanFile","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Cache/Scanner.php","line":388,"function":"handleChildren","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Cache/Scanner.php","line":340,"function":"scanChildren","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Cache/Scanner.php","line":510,"function":"scan","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Cache/Scanner.php","line":521,"function":"OC\\Files\\Cache\\{closure}","class":"OC\\Files\\Cache\\Scanner","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/Files/Cache/Scanner.php","line":509,"function":"runBackgroundScanJob","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/Utils/Scanner.php","line":185,"function":"backgroundScan","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/www/nextcloud/apps/files/lib/BackgroundJob/ScanFiles.php","line":89,"function":"backgroundScan","class":"OC\\Files\\Utils\\Scanner","type":"->"},{"file":"/var/www/nextcloud/apps/files/lib/BackgroundJob/ScanFiles.php","line":125,"function":"runScanner","class":"OCA\\Files\\BackgroundJob\\ScanFiles","type":"->"},{"file":"/var/www/nextcloud/lib/private/BackgroundJob/Job.php","line":51,"function":"run","class":"OCA\\Files\\BackgroundJob\\ScanFiles","type":"->"},{"file":"/var/www/nextcloud/lib/private/BackgroundJob/TimedJob.php","line":58,"function":"execute","class":"OC\\BackgroundJob\\Job","type":"->"},{"file":"/var/www/nextcloud/cron.php","line":127,"function":"execute","class":"OC\\BackgroundJob\\TimedJob","type":"->"}],"File":"/var/www/nextcloud/lib/private/Files/Cache/Cache.php","Line":340,"CustomMessage":"--"},"id":"61add307359bd"}
