That error message is telling you how to fix it.
Code:
6308x Usage: local itemIDs = C_EquipmentSet.GetItemIDs(equipmentSetID)
[C]: in function `GetItemIDs'
...faceBlizzard_Deprecated\Deprecated_7_2_0.lua:152: in function `GetEquipmentSetItemIDs'
That says "GetEquipmentSetItemID is deprecated. Use C_EquipmentSet.GetItemIDs instead."