I'm getting the following error when going into an arena:

`Message: Interface\AddOns\SpartanUI\libs\oUF\arena.lua:127: attempt to call method 'ForceUpdateTags' (a nil value)
Time: Sat Oct 6 21:48:44 2018
Count: 3
Stack: Interface\AddOns\SpartanUI\libs\oUF\arena.lua:127: attempt to call method 'ForceUpdateTags' (a nil value)
Interface\AddOns\SpartanUI\libs\oUF\arena.lua:127: in function <Interface\AddOns\SpartanUI\libs\oUF\arena.lua:79>
[C]: ?

Locals: self = SUI_Arena3 {
0 =
TextUpdate = defined @interface\AddOns\SpartanUI_PlayerFrames\scripts\FrameStyle_Classic.lua:97
__tags =

{
}
PLAYER_ENTERING_WORLD = defined @interface\AddOns\SpartanUI\libs\oUF\ouf.lua:208
UNIT_SPELLCAST_CHANNEL_START = defined @interface\AddOns\SpartanUI\libs\oUF\elements\castbar.lua:314
UNIT_SPELLCAST_INTERRUPTIBLE = defined @interface\AddOns\SpartanUI\libs\oUF\elements\castbar.lua:221
ARENA_PREP_OPPONENT_SPECIALIZATIONS = {
}
UNIT_HEALTH_FREQUENT = defined @interface\AddOns\SpartanUI\libs\oUF\elements\health.lua:166
BossGraphic = {
}
__elements = {
}
UNIT_POWER_FREQUENT = defined @interface\AddOns\SpartanUI\libs\oUF\elements\power.lua:236
Castbar = {
}
UNIT_HEAL_ABSORB_AMOUNT_CHANGED = defined @interface\AddOns\SpartanUI\libs\oUF\elements\healthprediction.lua:200
UNIT_SPELLCAST_NOT_INTERRUPTIBLE = defined @interface\AddOns\SpartanUI\libs\oUF\elements\castbar.lua:243
UNIT_THREAT_SITUATION_UPDATE = defined @interface\AddOns\SpartanUI\libs\oUF\elements\threatindicator.lua:90
UNIT_HEALTH = defined @interface\AddOns\SpartanUI\libs\oUF\elements\healthprediction.lua:200
style = "SUI_PlayerFrames_Classic"
artwork = {
}
UNIT_EXITED_VEHICLE = defined @interface\AddOns\SpartanUI\libs\oUF\ouf.lua:46
SmoothBar = defined @interface\AddOns\SpartanUI\libs\oUF_Plugins\oUF_Smooth.lua:17
UNIT_CONNECTION = {
}
UNIT_SPELLCAST_CHANNEL_STOP = defined @interface\AddOns\SpartanUI\libs\oUF\elements\castbar.lua:408
UNIT_SPELLCAST_CHANNEL_UPDATE = defined @interface\AddOns\SpartanUI\libs\oUF\elements\castbar.lua:378
UNIT_ABSORB_AMOUNT_CHANGED = defined @interface\AddOns\SpartanUI\libs\oUF\elements\healthprediction.lua:200
UNIT_HEAL_PREDICTION = defined @interface\AddOns\SpartanUI\libs\oUF\elements\healthprediction.lua:200
UNIT_SPELLCAST_INTERRUPTED = defined @interface\AddOns\SpartanUI\libs\oUF\elements\castbar.lua:193
RaidTargetIndicator = {
}
LevelSkull = {
}
UNIT_SPELLCAST_DELAYED = defined @interface\AddOns\SpartanUI\libs\oUF\elements\castbar.lua:265
Power = {
}
UNIT_SPELLCAST_START = defined @interface\AddOns\SpartanUI\libs\oUF\elements\castbar.lua:107
UNIT_POWER_BAR_SHOW = defined @interface\AddOns\SpartanUI\libs\oUF\elements\power.lua:236
RAID_TARGET_UPDATE = defined @interface\AddOns\SpartanUI\libs\oUF\elements\raidtargetindicator.lua:62
UNIT_SPELLCAST_STOP = defined @interface\AddOns\SpartanUI\libs\oUF\elements\castbar.lua:292
ARENA_OPPONENT_UPDATE = {
}
UNIT_MAXPOWER = defined @interface\AddOns\SpartanUI\libs\oUF\elements\power.lua:236
UNIT_DISPLAYPOWER = defined @interface\AddOns\SpartanUI\libs\oUF\elements\power.lua:236
UNIT_PET = defined @interface\AddOns\SpartanUI\libs\oUF\ouf.lua:248
UNIT_THREAT_LIST_UPDATE = defined @interface\AddOns\SpartanUI\libs\oUF\elements\threatindicator.lua:90
HealthPrediction = {
}
id = "3"
UNIT_EXITING_VEHICLE = defined @interface\AddOns\SpartanUI\libs\oUF\ouf.lua:46
UNIT_FACTION = {
}
ThreatIndicator = {
}
ColorUpdate = defined @interface\AddOns\SpartanUI_PlayerFrames\scripts\FrameStyle_Classic.lua:138
UNIT_ENTERED_VEHICLE = defined @interface\AddOns\SpartanUI\libs\oUF\ouf.lua:46
Name = `

I'm getting a similar one to
3x SpartanUI\libs\oUF\arena-Arena.lua:127: attempt to call method 'ForceUpdateTags' (a nil value)
SpartanUI\libs\oUF\arena-Arena.lua:127: in function <SpartanUI\libs\oUF\arena.lua:79>
[C]: ?

Locals:
self = SUI_Arena1 {
0 =
TextUpdate = defined @SpartanUI_PlayerFrames\scripts\FrameStyle_Classic.lua:97
__tags =

{
}
PLAYER_ENTERING_WORLD = defined @SpartanUI\libs\oUF\ouf.lua:208
UNIT_SPELLCAST_CHANNEL_START = defined @SpartanUI\libs\oUF\elements\castbar.lua:314
UNIT_SPELLCAST_INTERRUPTIBLE = defined @SpartanUI\libs\oUF\elements\castbar.lua:221
ARENA_PREP_OPPONENT_SPECIALIZATIONS = {
}
UNIT_HEALTH_FREQUENT = defined @SpartanUI\libs\oUF\elements\health.lua:166
BossGraphic = {
}
__elements = {
}
UNIT_POWER_FREQUENT = defined @SpartanUI\libs\oUF\elements\power.lua:236
Castbar = {
}
UNIT_HEAL_ABSORB_AMOUNT_CHANGED = defined @SpartanUI\libs\oUF\elements\healthprediction.lua:200
UNIT_SPELLCAST_NOT_INTERRUPTIBLE = defined @SpartanUI\libs\oUF\elements\castbar.lua:243
UNIT_THREAT_SITUATION_UPDATE = defined @SpartanUI\libs\oUF\elements\threatindicator.lua:90
UNIT_HEALTH = defined @SpartanUI\libs\oUF\elements\healthprediction.lua:200
style = "SUI_PlayerFrames_Classic"
artwork = {
}
mover = {
}
UNIT_EXITED_VEHICLE = defined @SpartanUI\libs\oUF\ouf.lua:46
SmoothBar = defined @SpartanUI\libs\oUF_Plugins\oUF_Smooth.lua:17
UNIT_CONNECTION = {
}
UNIT_SPELLCAST_CHANNEL_STOP = defined @SpartanUI\libs\oUF\elements\castbar.lua:408
UNIT_SPELLCAST_CHANNEL_UPDATE = defined @SpartanUI\libs\oUF\elements\castbar.lua:378
UNIT_ABSORB_AMOUNT_CHANGED = defined @SpartanUI\libs\oUF\elements\healthprediction.lua:200
UNIT_HEAL_PREDICTION = defined @SpartanUI\libs\oUF\elements\healthprediction.lua:200
UNIT_SPELLCAST_INTERRUPTED = defined @SpartanUI\libs\oUF\elements\castbar.lua:193
RaidTargetIndicator = {
}
LevelSkull = {
}
UNIT_SPELLCAST_DELAYED = defined @SpartanUI\libs\oUF\elements\castbar.lua:265
Power = {
}
UNIT_SPELLCAST_START = defined @SpartanUI\libs\oUF\elements\castbar.lua:107
UNIT_POWER_BAR_SHOW = defined @SpartanUI\libs\oUF\elements\power.lua:236
RAID_TARGET_UPDATE = defined @SpartanUI\libs\oUF\elements\raidtargetindicator.lua:62
UNIT_SPELLCAST_STOP = defined @SpartanUI\libs\oUF\elements\castbar.lua:292
ARENA_OPPONENT_UPDATE = {
}
UNIT_MAXPOWER = defined @SpartanUI\libs\oUF\elements\power.lua:236
UNIT_DISPLAYPOWER = defined @SpartanUI\libs\oUF\elements\power.lua:236
UNIT_PET = defined @SpartanUI\libs\oUF\ouf.lua:248
UNIT_THREAT_LIST_UPDATE = defined @SpartanUI\libs\oUF\elements\threatindicator.lua:90
HealthPrediction = {
}
id = "1"
UNIT_EXITING_VEHICLE = defined @SpartanUI\libs\oUF\ouf.lua:46
UNIT_FACTION = {
}
ThreatIndicator = {
}
ColorUpdate = defined @SpartanUI_PlayerFrames\scripts\FrameStyle_Classic.lua:138
UNIT_ENTERED_VEHICLE = defined @SpartanUI\libs\oUF\ouf.lua:46
Name = {
}
unit = "arena1"
Health = {
}
UNIT_POWER_BAR_HIDE = defined @SpartanUI\libs\oUF\elements\power.lua:236
UNIT_MAXHEALTH = {
}
UNIT_SPELLCAST_FAILED = defined @SpartanUI\libs\oUF\elements\castbar.lua:165
}
event = "ARENA_PREP_OPPONENT_SPECIALIZATIONS"
id = 1
specID = 253
(*temporary) = nil
(*temporary) = SUI_Arena1 {
0 =
TextUpdate = defined @interfac

Issue with oUF library, oUF was updated in the 5.0.13

If the issue returns please reopen.