HELP!!! FORUM COMPLETELY MESSED UP AFTER UPGRADE :-(

Hello, just updated to 2.3.3 latest and now my forum is completely gone :-(

Il Forum del KOG - No Ordinary Bikers ​

Forum dedicato a tutti i possessori della K1200LT e K1600

forum.kog.it

as soon as I enter the admin I got this

Code:

InvalidArgumentException: Must provide an existing add-on or add-on JSON in src/XF/AddOn/Manager.php at line 376
XF\AddOn\Manager->loadAddOnClass() in src/XF/AddOn/Manager.php at line 45
XF\AddOn\Manager->getAllAddOns() in src/XF/AddOn/Manager.php at line 69
XF\AddOn\Manager->getInstalledAddOns() in src/XF/Admin/Controller/IndexController.php...

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