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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, 12.0.2): 16.0.5
Operating system and version (eg, Ubuntu 17.04): 16.04
Apache or nginx version (eg, Apache 2.4.25): nginx 1.10.3
PHP version (eg, 7.1): 7.0
The issue you are facing:
Our logs are being spammed with the same error messages.
“Error while trying to create shared mount”
and
“InvalidArgumentException: Invalid recipient”
InvalidArgumentException: Invalid recipient
/snap/nextcloud/16739/htdocs/apps/files_sharing/lib/SharedMount.php - line 129:
OC\Share20\Manager->moveShare(OC\Share20\Share {}, “NotMetaIvan”)
/snap/nextcloud/16739/htdocs/apps/files_sharing/lib/SharedMount.php - line 111:
OCA\Files_Sharing\SharedMount->updateFileTarget("*** sensiti … “)
/snap/nextcloud/16739/htdocs/apps/files_sharing/lib/SharedMount.php - line 77:
OCA\Files_Sharing\SharedMount->verifyMountPoint(”** sensiti … *", { /NotMetaIv … }}, OC\Cache\CappedMemoryCache {})
/snap/nextcloud/16739/htdocs/apps/files_sharing/lib/MountProvider.php - line 115:
OCA\Files_Sharing\SharedMount->__construct("\OCA\File … e", { /NotMetaIv … }}, { user: “Not … e}, OC\Files\Sto … {}, OC\Files\View {}, OC\Cache\CappedMemoryCache {})
/snap/nextcloud/16739/htdocs/lib/private/Files/Config/MountProviderCollection.php - line 113:
OCA\Files_Sharing\MountProvider->getMountsForUser(OC\User\User {}, OC\Files\Sto … {})
/snap/nextcloud/16739/htdocs/lib/private/Files/Filesystem.php - line 447:
OC\Files\Config\MountProviderCollection->addMountForUser(OC\User\User {}, OC\Files\Mount\Manager {})
/snap/nextcloud/16739/htdocs/lib/private/Files/Filesystem.php - line 376:
OC\Files\Filesystem::initMountPoints(“NotMetaIvan”)
/snap/nextcloud/16739/htdocs/lib/private/legacy/util.php - line 309:
OC\Files\Filesystem::init(“NotMetaIvan”, “/NotMetaIvan/files”)
/snap/nextcloud/16739/htdocs/lib/private/Files/Utils/Scanner.php - line 106:
OC_Util::setupFS(“NotMetaIvan”)
/snap/nextcloud/16739/htdocs/lib/private/Files/Utils/Scanner.php - line 142:
OC\Files\Utils\Scanner->getMounts(”")
/snap/nextcloud/16739/htdocs/apps/files/lib/BackgroundJob/ScanFiles.php - line 88:
OC\Files\Utils\Scanner->backgroundScan("")
/snap/nextcloud/16739/htdocs/apps/files/lib/BackgroundJob/ScanFiles.php - line 112:
OCA\Files\BackgroundJob\ScanFiles->runScanner(OC\User\User {})
/snap/nextcloud/16739/htdocs/lib/private/BackgroundJob/Job.php - line 61:
OCA\Files\BackgroundJob\ScanFiles->run(null)
/snap/nextcloud/16739/htdocs/lib/private/BackgroundJob/TimedJob.php - line 55:
OC\BackgroundJob\Job->execute(OC\BackgroundJob\JobList {}, OC\Log {})
/snap/nextcloud/16739/htdocs/cron.php - line 123:
OC\BackgroundJob\TimedJob->execute(OC\BackgroundJob\JobList {}, OC\Log {})
Is this the first time you’ve seen this error? (Y/N): N
The user happens to be the last user created.
The log is repeating this message every 8 minutes. I need to archive the log every other day to keep the files down.
When I look around the internet I have seen that this issue was present in a previous nextcloud version but we are still experiencing it.
Any ideas are greatly appreciated, thanks!
The output of your Nextcloud log in Admin > Logging:
{"Exception":"InvalidArgumentException","Message":"Invalid recipient","Code":0,"Trace":[{"file":"\/snap\/nextcloud\/16739\/htdocs\/apps\/files_sharing\/lib\/SharedMount.php","line":129,"function":"moveShare","class":"OC\\Share20\\Manager","type":"->","args":[{"__class__":"OC\\Share20\\Share"},"NotMetaIvan"]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/apps\/files_sharing\/lib\/SharedMount.php","line":111,"function":"updateFileTarget","class":"OCA\\Files_Sharing\\SharedMount","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/apps\/files_sharing\/lib\/SharedMount.php","line":77,"function":"verifyMountPoint","class":"OCA\\Files_Sharing\\SharedMount","type":"->","args":["*** sensitive parameter replaced ***",{"\/NotMetaIvan\/files\/SSO_changes.md\/":{"__class__":"OCA\\Files_Sharing\\SharedMount"}},{"__class__":"OC\\Cache\\CappedMemoryCache"}]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/apps\/files_sharing\/lib\/MountProvider.php","line":115,"function":"__construct","class":"OCA\\Files_Sharing\\SharedMount","type":"->","args":["\\OCA\\Files_Sharing\\SharedStorage",{"\/NotMetaIvan\/files\/SSO_changes.md\/":{"__class__":"OCA\\Files_Sharing\\SharedMount"}},{"user":"NotMetaIvan","superShare":{"__class__":"OC\\Share20\\Share"},"groupedShares":[{"__class__":"OC\\Share20\\Share"}],"ownerView":{"__class__":"OC\\Files\\View"},"sharingDisabledForUser":false},{"__class__":"OC\\Files\\Storage\\StorageFactory"},{"__class__":"OC\\Files\\View"},{"__class__":"OC\\Cache\\CappedMemoryCache"}]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/lib\/private\/Files\/Config\/MountProviderCollection.php","line":113,"function":"getMountsForUser","class":"OCA\\Files_Sharing\\MountProvider","type":"->","args":[{"__class__":"OC\\User\\User"},{"__class__":"OC\\Files\\Storage\\StorageFactory"}]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/lib\/private\/Files\/Filesystem.php","line":447,"function":"addMountForUser","class":"OC\\Files\\Config\\MountProviderCollection","type":"->","args":[{"__class__":"OC\\User\\User"},{"__class__":"OC\\Files\\Mount\\Manager"}]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/lib\/private\/Files\/Filesystem.php","line":376,"function":"initMountPoints","class":"OC\\Files\\Filesystem","type":"::","args":["NotMetaIvan"]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/lib\/private\/legacy\/util.php","line":309,"function":"init","class":"OC\\Files\\Filesystem","type":"::","args":["NotMetaIvan","\/NotMetaIvan\/files"]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/lib\/private\/Files\/Utils\/Scanner.php","line":106,"function":"setupFS","class":"OC_Util","type":"::","args":["NotMetaIvan"]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/lib\/private\/Files\/Utils\/Scanner.php","line":142,"function":"getMounts","class":"OC\\Files\\Utils\\Scanner","type":"->","args":[""]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/apps\/files\/lib\/BackgroundJob\/ScanFiles.php","line":88,"function":"backgroundScan","class":"OC\\Files\\Utils\\Scanner","type":"->","args":[""]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/apps\/files\/lib\/BackgroundJob\/ScanFiles.php","line":112,"function":"runScanner","class":"OCA\\Files\\BackgroundJob\\ScanFiles","type":"->","args":[{"__class__":"OC\\User\\User"}]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/lib\/private\/BackgroundJob\/Job.php","line":61,"function":"run","class":"OCA\\Files\\BackgroundJob\\ScanFiles","type":"->","args":[null]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/lib\/private\/BackgroundJob\/TimedJob.php","line":55,"function":"execute","class":"OC\\BackgroundJob\\Job","type":"->","args":[{"__class__":"OC\\BackgroundJob\\JobList"},{"__class__":"OC\\Log"}]},{"file":"\/snap\/nextcloud\/16739\/htdocs\/cron.php","line":123,"function":"execute","class":"OC\\BackgroundJob\\TimedJob","type":"->","args":[{"__class__":"OC\\BackgroundJob\\JobList"},{"__class__":"OC\\Log"}]}],"File":"\/snap\/nextcloud\/16739\/htdocs\/lib\/private\/Share20\/Manager.php","Line":1056,"CustomMessage":"--"},"userAgent":"--","version":"16.0.5.1"}
{"reqId":"TLSvq5aUwo819cklzPCF","level":3,"time":"2019-12-30T21:27:45+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"","url":"\/cloud\/cron.php","message":"Error while trying to create shared mount","userAgent":"--","version":"16.0.5.1"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'apps_paths' =>
array (
0 =>
array (
'path' => '/snap/nextcloud/current/htdocs/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/snap/nextcloud/current/nextcloud/extra-apps',
'url' => '/extra-apps',
'writable' => true,
),
),
'supportedDatabases' =>
array (
0 => 'mysql',
),
'memcache.locking' => '\\OC\\Memcache\\Redis',
'memcache.local' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/tmp/sockets/redis.sock',
'port' => 0,
),
'passwordsalt' => 'X1SA5REYudTPm1LNrq2JLdOKfnjTuf',
'secret' => 'S4ufj4Jrynfd4/LlfvvDepDgcumM2QagWqWa5vO5wYX/zvO6',
'trusted_domains' =>
array (
0 => 'localhost',
1 => '127.0.0.1',
2 => 'rednowerton.tk',
3 => 'rednowerton.tk/cloud',
),
'datadirectory' => '/var/snap/nextcloud/common/nextcloud/data',
'dbtype' => 'mysql',
'version' => '16.0.5.1',
'overwrite.cli.url' => 'https://rednowerton.tk/cloud',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:/tmp/sockets/mysql.sock',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => 'CqZFn1W1s9m_9asdkljsdklajdkasldjsajsrg4ol73e2xgNbaHIbBvFsAx123123sbcnq4',
'installed' => true,
'instanceid' => 'oc8zc1omq8dj',
'maintenance' => false,
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'loglevel' => 2,
'overwritehost' => 'rednowerton.tk',
'overwriteprotocol' => 'https',
'overwritewebroot' => '/cloud',
);