Addons stopped workin

So I keep getting a bunch of error messages when I boot up my games, all from different addons. This is one of the many error messages:

Date: 2023-02-12 13:54:40
ID: -2
Error occured in: Global
Count: 1
Message: ..AddOnsSpySpy.lua line 1305:
attempt to index field 'MainWindow' (a nil value)
Debug:
(tail call): ?
SpySpy.lua:1305: ?()
...ibsAce3CallbackHandler-1.0CallbackHandler-1.0.lua:146:
...ibsAce3CallbackHandler-1.0CallbackHandler-1.0.lua:146
[string "safecall Dispatcher[1]"]:4:
[string "safecall Dispatcher[1]"]:4
[C]: ?
[string "safecall Dispatcher[1]"]:13: ?()
...ibsAce3CallbackHandler-1.0CallbackHandler-1.0.lua:91: Fire()
...ddOnsGatherMate2LibsAceEvent-3.0AceEvent-3.0.lua:120:
...ddOnsGatherMate2LibsAceEvent-3.0AceEvent-3.0.lua:119
AddOns:
Swatter, v3.1.14 (<%codename%>)
ArkInventory, v3.01
Bagnon, v2.13.3
BagnonForever, v1.1.2
BagnonTooltips, v
BankItems, v9.0.2.3
GatherMate2, v1.46.4-classic-3-g2a70b5d
GearScoreLite, v4.0.1
HealBot, v3.3.5.4
MapCoords, v0.7
Necrosis, v3.0 (r225)
Omen, v3.0.9
OmniCC, v3.0.4
RandomMount, v0.9.83
Recount, v
RuneItAll, v3.1.1
SlideBar, v3.1.14 (<%codename%>)
Spy, v
TidyPlates, v5.12 Beta 11
TidyPlatesGrey, v
TidyPlatesNeon, v3
TidyPlatesThreatPlates, v3.0.4
BlizRuntimeLib_enUS v3.3.5.30300 <logon.warmane.com>
(ck=22d)

Disable your addons one by one until the problem disappears.

Thank you very much I found the addon that did not work: Slidebar (lib)