Fatal error: Uncaught Error: Class "Kirby\Panel\Model" not found in /volume1/web/public/kirbi/kirby-4.1.0/src/Panel/Site.php on line 19

Error: Class "Kirby\Panel\Model" not found in /volume1/web/public/kirbi/kirby-4.1.0/src/Panel/Site.php on line 19

Call Stack:
    0.0510     353784   1. {main}() /volume1/web/public/kirbi/kirby-4.1.0/src/Panel/Site.php:0