Describe the bug

Installed weakauras and got this error upon loading. Tried reinstalling to no avail.

Do you have an error log of what happened?
Improper arguments to WeakAuras.SetRegion - regionType not defined
[C]: error'
..\AddOns\WeakAuras\WeakAuras.lua line 4401:
in function SetRegion'
..\AddOns\WeakAuras\WeakAuras.lua line 4365:
in function <..\AddOns\WeakAuras\WeakAuras.lua:4268>
..\AddOns\WeakAuras\WeakAuras.lua line 4395:
in function Add' ..\AddOns\WeakAuras\WeakAuras.lua line 3928: in function load'
..\AddOns\WeakAuras\WeakAuras.lua line 3935:
in function `AddMany'
..\AddOns\WeakAuras\WeakAuras.lua line 1606:
in function <..\AddOns\WeakAuras\WeakAuras.lua:1578>

Debug:
WeakAuras\WeakAuras.lua:1734:
WeakAuras\WeakAuras.lua:1685
Locals:
None
AddOns:
Swatter, v8.2.6377 (SwimmingSeadragon)
Atlas, vv1.47.00.11303.00
AtlasBattlegrounds, vv1.46.00.11303.00
AtlasClassicWoW, vv1.47.00.11303.00
AtlasDungeonLocs, vv1.47.00.11303.00
AtlasLootClassic, vv1.4.8
AtlasLootClassicData, vv1.4.8
AtlasLootClassicDungeonsAndRaids, vv1.4.8
AucAdvanced, v8.2.6430 (SwimmingSeadragon)
AucFilterBasic, v8.2.6364 (SwimmingSeadragon)
AucStatHistogram, v8.2.6366 (SwimmingSeadragon)
AucStatiLevel, v8.2.6370 (SwimmingSeadragon)
AucStatPurchased, v8.2.6367 (SwimmingSeadragon)
AucStatSimple, v8.2.6399 (SwimmingSeadragon)
AucStatStdDev, v8.2.6369 (SwimmingSeadragon)
AucUtilFixAH, v8.2.6371 (SwimmingSeadragon)
BagBrother, v
Bagnon, v8.3.5
BeanCounter, v8.2.6434 (SwimmingSeadragon)
ClassicCastbars, vv1.3.3
ClassicCastbarsOptions, v
DBMCore, v1.13.42
DBMDefaultSkin, v
DBMStatusBarTimers, v
Details, v
DetailsStreamer, v
DetailsTinyThreat, v
Dominos, v8.3.1
DominosCast, v
DominosProgress, v
DominosRoll, v
GatherMate2, v1.45.5
GTFO, v4.55
GuildRosterManager, v1.871
Informant, v8.2.6374 (SwimmingSeadragon)
ItemRack, v
LeatrixMaps, v1.13.57
Necrosis, v6.4
OmniCC, v8.3.5
Prat30, v3.7.50
Prat30Libraries, v
Questie, v5.10.0 0 fd3ff918
SexyMap, vv5-classic
ShadowedUnitFrames, vv4.2.3-Classic-1-ga64713d
SkilletClassic, v1.13
SlideBar, v8.2.6375 (SwimmingSeadragon)
Spy, v1.0.24
Stubby, v8.2.6376 (SwimmingSeadragon)
TellMeWhen, v8.7.5
TomTom, vv11304-1.1.2
VendorPrice, v1.3.5
WeakAuras, v2.16.6
WIM, v3.8.8
BlizRuntimeLib_enUS v1.13.4.11304
(ck=632)

Unfortunately that was a error in one of the recent alphas, which corrupted your settings. You should restore your setting from a backup. If you are using the companion app, that automatically saves backups.