Message: Interface/AddOns/CraftSim/DB/itemRecipeDB.lua:44: bad argument #1 to 'pairs' (table expected, got nil)
Time: Sat Apr 27 12:41:01 2024
Count: 1
Stack: Interface/AddOns/CraftSim/DB/itemRecipeDB.lua:44: bad argument #1 to 'pairs' (table expected, got nil)
[string "=[C]"]: in function pairs' [string "@Interface/AddOns/CraftSim/DB/itemRecipeDB.lua"]:44: in function Migrate'
[string "@Interface/AddOns/CraftSim/DB/DB.lua"]:49: in function Init' [string "@Interface/AddOns/CraftSim/Init/Init.lua"]:236: in function ?'
[string "@Interface/AddOns/CraftSim/Libs/GUTIL/GUTIL.lua"]:232: in function <Interface/AddOns/CraftSim/Libs/GUTIL/GUTIL.lua:232>

Locals: (*temporary) = nil
(*temporary) = "table expected, got nil"
= defined =[C]:-1

2nd error in thos row:

Message: Interface/AddOns/CraftSim/DB/multicraftPreloadDB.lua:37: attempt to index field 'multicraftPreloadDB' (a nil value)
Time: Sat Apr 27 12:41:15 2024
Count: 1
Stack: Interface/AddOns/CraftSim/DB/multicraftPreloadDB.lua:37: attempt to index field 'multicraftPreloadDB' (a nil value)
[string "=[C]"]: ?
[string "@Interface/AddOns/CraftSim/DB/multicraftPreloadDB.lua"]:37: in function ClearAll' [string "@Interface/AddOns/CraftSim/Init/Init.lua"]:36: in function ?'
[string "@Interface/AddOns/CraftSim/Libs/GUTIL/GUTIL.lua"]:232: in function <Interface/AddOns/CraftSim/Libs/GUTIL/GUTIL.lua:232>

Locals: (*temporary) = defined =[C]:-1

I've run into this as well.
Craftsim windows won't show, which prompted me to see if anything came up in bugsack.
No idea if the error is related to the addon not working for me, or not.

-> 16.1.5