I can’t open the addon, only get this message on my screen.

Message: Interface\AddOns\Backpack\core\Slots.lua:143: attempt to index local 'Slot' (a nil value)
Time: Wed Jun 17 17:09:11 2020
Count: 1
Stack: Interface\AddOns\Backpack\core\Slots.lua:143: attempt to index local 'Slot' (a nil value)
[string "=[C]"]: ?
[string "@interface\AddOns\Backpack\core\Slots.lua"]:143: in function UpdateSlot' [string "@interface\AddOns\Backpack\core\Slots.lua"]:239: in function UpdateContainerSlots'
[string "@interface\AddOns\Backpack\core\Slots.lua"]:245: in function UpdateAllSlots' [string "@interface\AddOns\Backpack\core\Core.lua"]:263: in function Toggle'
[string "@interface\AddOns\Backpack\core\Blizzard.lua"]:4: in function <Interface\AddOns\Backpack\core\Blizzard.lua:3>
[string "=[C]"]: in function `ToggleAllBags'
[string "OPENALLBAGS"]:1: in function <[string "OPENALLBAGS"]:1>