Describe the bug
This error appeared upon logging on after the update:

1x FarmingBar\Modules\Bars.lua:101: bad argument #1 to 'pairs' (table expected, got nil)
[string "=[C]"]: in function pairs' [string "@FarmingBar\Modules\Bars.lua"]:101: in function ReleaseAllBars'
[string "@FarmingBar\Modules\Bars.lua"]:87: in function InitializeBars' [string "@FarmingBar\FarmingBar-v3.0.0.lua"]:15: in function <FarmingBar\FarmingBar.lua:14> [string "=[C]"]: ? [string "@DataStore\libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:70: in function <DataStore\libs\AceAddon-3.0\AceAddon-3.0.lua:65> [string "@DataStore\libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:527: in function EnableAddon'
[string "@datastore\libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:630: in function <DataStore\libs\AceAddon-3.0\AceAddon-3.0.lua:615>
[string "=[C]"]: in function LoadAddOn' [string "@ArkInventory\Core\ArkInventory-31000.8.lua"]:10739: in function LoadAddOn'
[string "@arkinventory\Core\ArkInventory-31000.8.lua"]:10768: in function BlizzardAPIHook' [string "@ArkInventory\Core\ArkInventory-31000.8.lua"]:2837: in function <ArkInventory\Core\ArkInventory.lua:2806> [string "=[C]"]: ? [string "@DataStore\libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:70: in function <DataStore\libs\AceAddon-3.0\AceAddon-3.0.lua:65> [string "@DataStore\libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:527: in function EnableAddon'
[string "@datastore\libs\AceAddon-3.0\AceAddon-3.0-13.lua"]:630: in function <DataStore\libs\AceAddon-3.0\AceAddon-3.0.lua:615>

Client
WotLK Classic

To Reproduce
Steps to reproduce the behavior:

1. Update to latest
2. Log in.

Expected behavior
Expected the addon to load, got no farming bars.

Screenshots
No screenshots needed or provided.

Additional context
No additional contexts needed.

UPDATE: Ok, it seems that curseforge didn't load it properly and I did it again and now it works. However my previous bars have disappeared from the HUD and the old ones got sort of archived into templates. Not sure if that's what it's supposed to do.

Yes, that is the intended behavior due to the way the database and profiles have been changed. By default now profiles are shared between toons and you create new profiles for different setups.