Cannot read other users icon

Nextcloud version : 20.0.2
Operating system and version Ubuntu : 20.04
Apache version Apache : 2.4.41
PHP version : 7.4.3

The issue you are facing:
I got a problem with user list on NC 20.0.2.
I my NC server can not read other user’s icon.

Is this the first time you’ve seen this error? : Y

Steps to replicate it:

  1. Open the users list
  2. Other users icon will be a broken link

The output of your Nextcloud log in Admin > Logging:

Error	remote	
TypeError: Argument 1 passed to OCA\DAV\Files\BrowserErrorPagePlugin::logException() must be an instance of Exception, instance of Error given, called in /var/www/html/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php on line 89

/var/www/html/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php - line 89:
OCA\DAV\Files\BrowserErrorPagePlugin->logException()

/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 254:
Sabre\DAV\Server->emit()

/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 319:
Sabre\DAV\Server->start()

/var/www/html/nextcloud/apps/dav/lib/Server.php - line 332:
Sabre\DAV\Server->exec()

/var/www/html/nextcloud/apps/dav/appinfo/v2/remote.php - line 35:
OCA\DAV\Server->exec()

/var/www/html/nextcloud/remote.php - line 167:
require_once("/var/www/ht ... p")
Fatal	webdav
Error: Class 'OCA\DAV\CalDAV\Principal\User' not found
/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAVACL/AbstractPrincipalCollection.php - line 123:
OCA\DAV\CalDAV\Principal\Collection->getChildForPrincipal()

/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Tree.php - line 80:
Sabre\DAVACL\AbstractPrincipalCollection->getChild()

/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAVACL/Plugin.php - line 337:
Sabre\DAV\Tree->getNodeForPath()

/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAVACL/Plugin.php - line 390:
Sabre\DAVACL\Plugin->getPrincipalMembership()

/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAVACL/Plugin.php - line 643:
Sabre\DAVACL\Plugin->principalMatchesPrincipal()

/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAVACL/Plugin.php - line 199:
Sabre\DAVACL\Plugin->getCurrentUserPrivilegeSet()

/var/www/html/nextcloud/apps/dav/lib/Connector/Sabre/DavAclPlugin.php - line 53:
Sabre\DAVACL\Plugin->checkPrivileges()

/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAVACL/Plugin.php - line 853:
OCA\DAV\Connector\Sabre\DavAclPlugin->checkPrivileges()

/var/www/html/nextcloud/apps/dav/lib/Connector/Sabre/DavAclPlugin.php - line 99:
Sabre\DAVACL\Plugin->beforeMethod()

/var/www/html/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php - line 89:
OCA\DAV\Connector\Sabre\DavAclPlugin->beforeMethod()

/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 458:
Sabre\DAV\Server->emit()

/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 251:
Sabre\DAV\Server->invokeMethod()

/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 319:
Sabre\DAV\Server->start()

/var/www/html/nextcloud/apps/dav/lib/Server.php - line 332:
Sabre\DAV\Server->exec()

/var/www/html/nextcloud/apps/dav/appinfo/v2/remote.php - line 35:
OCA\DAV\Server->exec()

/var/www/html/nextcloud/remote.php - line 167:
require_once("/var/www/ht ... p")