update.php failed for mediawiki-1.38.0

Hi.
When running "php update.php" I get this error:

php update.php
PHP Fatal error:  Uncaught Exception: Unable to open file 
/Cite/extension.json: filemtime(): stat failed for /Cite/extension.json 
in 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/includes/registration/ExtensionRegistry.php:182
Stack trace:
#0 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/includes/GlobalFunctions.php(52): 
ExtensionRegistry->queue()
#1 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/LocalSettings.php(203): 
wfLoadExtension()
#2 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/includes/Setup.php(204): 
require_once('...')
#3 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/maintenance/doMaintenance.php(96): 
require_once('...')
#4 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/maintenance/update.php(264): 
require_once('...')
#5 {main}
   thrown in 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/includes/registration/ExtensionRegistry.php 
on line 182
Fatal error: Uncaught Exception: Unable to open file 
/Cite/extension.json: filemtime(): stat failed for /Cite/extension.json 
in 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/includes/registration/ExtensionRegistry.php:182
Stack trace:
#0 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/includes/GlobalFunctions.php(52): 
ExtensionRegistry->queue()
#1 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/LocalSettings.php(203): 
wfLoadExtension()
#2 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/includes/Setup.php(204): 
require_once('...')
#3 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/maintenance/doMaintenance.php(96): 
require_once('...')
#4 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/maintenance/update.php(264): 
require_once('...')
#5 {main}
   thrown in 
/srv/http/wiki.intranet.lamby.de/mediawiki-1.38.0/includes/registration/ExtensionRegistry.php 
on line 182