Error message with SAML when using SSO

Dear

when i use the url to connect to my nextcloud i have a blank page and in the logs i see thiserror message

Error no app in context Error: Call to a member function register() on string

/var/www/nextcloud/lib/private/legacy/app.php - line 261:

require_once()

i’am using nextclous 16.0
/var/www/nextcloud/lib/private/legacy/app.php - line 154:

OC_App::requireAppFile("firstrunwizard")

/var/www/nextcloud/lib/private/legacy/app.php - line 127:

OC_App::loadApp("firstrunwizard")

/var/www/nextcloud/lib/base.php - line 960:

OC_App::loadApps()

/var/www/nextcloud/index.php - line 42:

OC::handleRequest()

can someone help please ? i’am using nextcloud version 16.0.0.9

Thank you