The addon can not be used when start with a fresh install and an empty saved variables file.
Message: Interface/AddOns/CraftSim/DB/itemCountDB.lua:104: attempt to index field 'characters' (a nil value) Time: Wed Aug 21 09:26:32 2024 Count: 1 Stack: Interface/AddOns/CraftSim/DB/itemCountDB.lua:104: attempt to index field 'characters' (a nil value) [string "=[C]"]: ? [string "@Interface/AddOns/CraftSim/DB/itemCountDB.lua"]:104: in function SaveInventoryCount'
[string "@Interface/AddOns/CraftSim/DB/itemCountDB.lua"]:134: in function UpdateItemCounts' [string "@Interface/AddOns/CraftSim/Modules/ItemCount/ItemCount.lua"]:58: in function UpdateAllCountsForItemID'
[string "@Interface/AddOns/CraftSim/Modules/ItemCount/ItemCount.lua"]:85: in function countBagItems' [string "@Interface/AddOns/CraftSim/Modules/ItemCount/ItemCount.lua"]:93: in function UpdateItemCountForCharacter'
[string "@Interface/AddOns/CraftSim/Modules/ItemCount/ItemCount.lua"]:62: in function `?'
[string "@Interface/AddOns/CraftSim/Libs/GUTIL/GUTIL.lua"]:232: in function <Interface/AddOns/CraftSim/Libs/GUTIL/GUTIL.lua:232>

Locals: `

Running version: 17.1.1

if any db issues arise, try
/craftsim resetdb

Selecting older expansions also helped