What is the expected output? What do you see instead?
i was expecting to see the enemy frames, but it don't show anything

What version of the product are you using?
v2.0.16-beta

Do you have an error log of what happened?
i got 13lua errors when the arena start
2related to gladius, 11 related to "FrameXML\UIPanelTemplates.lua:393"

1º:
Message: Interface\AddOns\Gladius\modules\auras.lua:125 attempt to index field '?' (a nil value)
Time: 11/13/11 16:32:10
Count: 4
Stack: Interface\AddOns\Gladius\modules\auras.lua:125 in function `UNIT_AURA'
Interface\AddOns\Gladius\modules\auras.lua:220 in function `CreateFrame'
Interface\AddOns\Gladius\modules\auras.lua:229 in function `?'
Interface\AddOns\Gladius\Gladius.lua:40 in function `Call'
Interface\AddOns\Gladius\Gladius.lua:518 in function `UpdateUnit'
Interface\AddOns\Gladius\Gladius.lua:364 in function `JoinedArena'
Interface\AddOns\Gladius\Gladius.lua:333 in function `?'
Interface\AddOns\Gladius\Gladius.lua:22 in function <Interface\AddOns\Gladius\Gladius.lua:13

Locals: self = <table> {
 defaults = <table> {
 }
 messages = <table> {
 }
 Enable = <function> defined @Interface\AddOns\Gladius\Gladius.lua:104
 UnregisterAllEvents = <function> defined @Interface\AddOns\Gladius\Gladius.lua:99
 GetIndicatorHeight = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:105
 CreateFrame = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:160
 enabled = true
 eventHandler = <unnamed> {
 }
 GetOptions = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:444
 attachTo = true
 name = "Auras"
 IsEnabled = <function> defined @Interface\AddOns\Gladius\Gladius.lua:124
 SetTemplate = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:75
 Disable = <function> defined @Interface\AddOns\Gladius\Gladius.lua:114
 RegisterMessage = <function> defined @Interface\AddOns\Gladius\Gladius.lua:129
 Update = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:224
 isBarOption = false
 templates = <table> {
 }
 SendMessage = <function> defined @Interface\AddOns\Gladius\Gladius.lua:133
 UNIT_AURA = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:119
 OnDisable = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:63
 GetAuraList = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:1041
 RegisterEvent = <function> defined @Interface\AddOns\Gladius\Gladius.lua:89
 GetAttachTo = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:97
 Show = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:384
 buffFrame = <table> {
 }
 OnEnable = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:51
 debuffFrame = <table> {
 }
 SetupAura = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:997
 Test = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:428
 GetFrame = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:101
 UnregisterEvent = <function> defined @Interface\AddOns\Gladius\Gladius.lua:94
 Reset = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:406
}
event = nil
unit = "arena1"
(for index) = 1
(for limit) = 40
(for step) = 1
i = 1
name = nil
rank = nil
icon = nil
count = nil
dispelType = nil
duration = nil
expires = nil
caster = nil
isStealable = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to index field '?' (a nil value)"
strfind = <function> defined =[C]:-1
UnitAura = <function> defined =[C]:-1
Gladius = <table> {
 GetColorOption = <function> defined @Interface\AddOns\Gladius\options.lua:148
 defaults = <table> {
 }
 testCount = 0
 instanceType = "none"
 OnInitialize = <function> defined @Interface\AddOns\Gladius\Gladius.lua:207
 NewModule = <function> defined @Interface\AddOns\Gladius\Gladius.lua:73
 EnableModule = <function> defined @Interface\AddOns\Gladius\Gladius.lua:183
 modules = <table> {
 }
 GetModule = <function> defined @Interface\AddOns\Gladius\Gladius.lua:191
 GetModules = <function> defined @Interface\AddOns\Gladius\Gladius.lua:195
 SetColorOption = <function> defined @Interface\AddOns\Gladius\options.lua:153
 CreateButton = <function> defined @Interface\AddOns\Gladius\Gladius.lua:721
 options = <table> {
 }
 UNIT_NAME_UPDATE = <function> defined @Inte

2º:
Message: Interface\AddOns\Gladius\modules\auras.lua:125 attempt to index field '?' (a nil value)
Time: 11/13/11 16:33:31
Count: 76
Stack: Interface\AddOns\Gladius\modules\auras.lua:125 in function `?'
Interface\AddOns\Gladius\Gladius.lua:85 in function <Interface\AddOns\Gladius\Gladius.lua:81

Locals: self = <table> {
 defaults = <table> {
 }
 messages = <table> {
 }
 Enable = <function> defined @Interface\AddOns\Gladius\Gladius.lua:104
 UnregisterAllEvents = <function> defined @Interface\AddOns\Gladius\Gladius.lua:99
 GetIndicatorHeight = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:105
 CreateFrame = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:160
 enabled = true
 eventHandler = <unnamed> {
 }
 GetOptions = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:444
 attachTo = true
 name = "Auras"
 IsEnabled = <function> defined @Interface\AddOns\Gladius\Gladius.lua:124
 SetTemplate = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:75
 Disable = <function> defined @Interface\AddOns\Gladius\Gladius.lua:114
 RegisterMessage = <function> defined @Interface\AddOns\Gladius\Gladius.lua:129
 Update = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:224
 isBarOption = false
 templates = <table> {
 }
 SendMessage = <function> defined @Interface\AddOns\Gladius\Gladius.lua:133
 UNIT_AURA = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:119
 OnDisable = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:63
 GetAuraList = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:1041
 RegisterEvent = <function> defined @Interface\AddOns\Gladius\Gladius.lua:89
 GetAttachTo = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:97
 Show = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:384
 buffFrame = <table> {
 }
 OnEnable = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:51
 debuffFrame = <table> {
 }
 SetupAura = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:997
 Test = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:428
 GetFrame = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:101
 UnregisterEvent = <function> defined @Interface\AddOns\Gladius\Gladius.lua:94
 Reset = <function> defined @Interface\AddOns\Gladius\modules\auras.lua:406
}
event = "UNIT_AURA"
unit = "arena2"
(for index) = 1
(for limit) = 40
(for step) = 1
i = 1
name = "Fel Armor"
rank = ""
icon = "Interface\Icons\Spell_Shadow_FelArmour"
count = 0
dispelType = nil
duration = 0
expires = 0
caster = "arena2"
isStealable = nil
(*temporary) = nil
(*temporary) = 0
(*temporary) = "arena2"
(*temporary) = nil
(*temporary) = 1
(*temporary) = 28176
(*temporary) = "attempt to index field '?' (a nil value)"
strfind = <function> defined =[C]:-1
UnitAura = <function> defined =[C]:-1
Gladius = <table> {
 GetColorOption = <function> defined @Interface\AddOns\Gladius\options.lua:148
 defaults = <table> {
 }
 testCount = 0
 instanceType = "none"
 OnInitialize = <function> defined @Interface\AddOns\Gladius\Gladius.lua:207
 NewModule = <function> defined @Interface\AddOns\Gladius\Gladius.lua:73
 EnableModule = <function> defined @Interface\AddOns\Gladius\Gladius.lua:183
 modules = <table> {
 }
 GetModule = <function> defined @Interface\AddOns\Gladius\Gladius.lua:191
 GetModules = <function> defined @Interface\AddOns\Gladius\Gladius.lua:195
 SetColorOption = <function> defined @Interface\AddOns\Gladius\options.lua:153
 CreateButton = <function> defined @Interface\AddOns\Gladius\Gladius.lua:721
 options = <table> {
 }
 UNIT_NAME_UPDATE = <function> defined @Interface\AddOns\Gladius\Gladius.lua:399
 UpdateFrame = <function> defined @Interface\AddOns\Gladius\Gladius.lua:422
 OnProfileChanged = <function> defined @Interface\AddOns\Gladius\Gladius.lua:323
 eventHandler = <unnamed> {
 }
 background = GladiusButtonBackground {
 }
 UNIT_HEALTH = <function> defined @Interface\AddOns\Gladius\Gladius.lua:839

i think u only need this related to gladius or u also need the others?