InventoryManager error

[samran]

I have start to get this er error :

Message: ...erface\AddOns\ZygorGuidesViewer\InventoryManage r.lua:1083: attempt to compare number with nil
Time: Sat Jul 21 22:27:29 2018
Count: 8
Stack: ...erface\AddOns\ZygorGuidesViewer\InventoryManage r.lua:1083: attempt to compare number with nil
[C]: ?
...erface\AddOns\ZygorGuidesViewer\InventoryManage r.lua:1083: in function `GetUnusableItems'
...ace\AddOns\ZygorGuidesViewer\Loot-SellItemsPopup.lua:116: in function `SetItems'
Interface\AddOns\ZygorGuidesViewer\Loot.lua:142: in function `SellUnusableItems'
Interface\AddOns\ZygorGuidesViewer\Loot.lua:304: in function <Interface\AddOns\ZygorGuidesViewer\Loot.lua:290 >

Locals:

[ZG Support 1]

Try doing a full guide wipe/reset.

1. exit WoW
2. go to the WoW/Interface/Addons folder and delete the ZygorGuidesViewer folder
3. go to the WoW/WTF/Account/<accountname>/SavedVariables folder and delete the Zygor files in there
4. run the desktop client and install a fresh copy of the guides
5. go back in game to test and let me know if that fixed it