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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): 20.0.8
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04.2 LTS
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.41 (Ubuntu)
PHP version (eg, 7.4): PHP 7.4.3
The issue you are facing:
When reviewing the log in Settings - Administration - Logging, I see the following fatal exception:
Fatal webdav Doctrine\DBAL\DBALException: An exception occurred while executing ‘INSERT INTO oc_properties (userid,propertypath,propertyname,propertyvalue) VALUES(?,?,?,?)’ with params [“xxxxxx”, “addressbooks/users/xxxxxx”, “{http://calendarserver.org/ns/}me-card”, {}]: Object of class Sabre\DAV\Xml\Property\Href could not be converted to string
Is this the first time you’ve seen this error? (Y/N):N
Steps to replicate it:
- I am not sure what is triggering it. It may have to do with adding calendar events in Apple Calendar synced to NC.
The output of your Nextcloud log in Admin > Logging:
Fatal webdav Doctrine\DBAL\DBALException: An exception occurred while executing 'INSERT INTO `oc_properties` (`userid`,`propertypath`,`propertyname`,`propertyvalue`) VALUES(?,?,?,?)' with params ["xxxxxx", "addressbooks\/users\/xxxxxx", "{http:\/\/calendarserver.org\/ns\/}me-card", {}]: Object of class Sabre\DAV\Xml\Property\Href could not be converted to string
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'xxxx',
'passwordsalt' => 'xxx',
'secret' => 'xxx',
'trusted_domains' =>
array (
0 => 'nextcloud.example.com',
),
'datadirectory' => '/var/www/nextcloud-data/',
'dbtype' => 'mysql',
'version' => '20.0.8.1',
'overwrite.cli.url' => 'https://nextcloud.example.com',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:3306',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'xxx',
'dbpassword' => 'xxx',
'installed' => true,
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'pipe',
'mail_from_address' => 'xxx',
'mail_domain' => 'example.com',
'mail_smtpauth' => 1,
'mail_smtphost' => 'localhost',
'mail_smtpport' => '1025',
'mail_smtpname' => 'xxx@example.com',
'mail_smtppassword' => 'xxx',
'mail_smtptimeout' => 30,
'remember_login_cookie_lifetime' => 1296000,
'session_lifetime' => 2700,
'session_keepalive' => false,
'auto_logout' => true,
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.local' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'localhost',
'port' => 6379,
),
'maintenance' => false,
'updater.release.channel' => 'stable',
'theme' => '',
'loglevel' => 2,
);
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE