Uiparent_managed_frame_positions

[Uitat]

working on getting The "Castbars" addon working again.

i know there are multiple errors beyond this one but i am at a loss for this
i am unable to locate any info about UIPARENT_MANAGED_FRAME_POSITIONS

here is the error and the code block, any of you that are considered brilliant want to help guide me through this? i would be appreciative.

1x Interface/AddOns/Castbars/Castbars.lua:1344: attempt to index global 'UIPARENT_MANAGED_FRAME_POSITIONS' (a nil value)
[string "@Interface/AddOns/Castbars/Castbars.lua"]:1344: in function <Interface/AddOns/Castbars/Castbars.lua:1243>
[string "=[C]"]: ?
[string "@Interface/AddOns/Ace3/AceAddon-3.0-13/AceAddon-3.0.lua"]:66: in function <Interface/AddOns/Ace3/AceAddon-3.0/AceAddon-3.0.lua:61>
[string "@Interface/AddOns/Ace3/AceAddon-3.0-13/AceAddon-3.0.lua"]:494: in function `InitializeAddon'
[string "@Interface/AddOns/Ace3/AceAddon-3.0-13/AceAddon-3.0.lua"]:619: in function <Interface/AddOns/Ace3/AceAddon-3.0/AceAddon-3.0.lua:611>

UIPARENT_MANAGED_FRAME_POSITIONS["PlayerCastingBarFrame"] = nil;