InvalidArgumentException: Must provide an existing add-on or add-on JSON

A small hint would be very helpful here, which add-on makes the problems ...

Code:

InvalidArgumentException: Must provide an existing add-on or add-on JSON in src/XF/AddOn/Manager.php at line 366

    XF\AddOn\Manager->loadAddOnClass() in src/XF/AddOn/Manager.php at line 41
    XF\AddOn\Manager->getAllAddOns() in src/XF/Admin/Controller/AddOn.php at line 27
    XF\Admin\Controller\AddOn->actionIndex() in src/XF/Mvc/Dispatcher.php at line 352
    XF\Mvc\Dispatcher->dispatchClass() in...

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