WoWInterface - Uiparent_managed_frame

i am in the process of fixing Castbars, but i have encountered something i have not seen no can find any information on, i know its part of the default UI stuff, or used to be???..

i have already updated all the libraries just to be sure it was not an issue there

here is the error

Lua Code:

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

here is the offending code block, any info or suggestions is welcome at this point beating my head on a brick all on this one.

Lua Code:

-- Prevent the UIParent from moving the CastingBarFrame around
    UIPARENT_MANAGED_FRAME_POSITIONS["CastingBarFrame"] = nil;
    -- Reset player and pet casting bars in case another addon have 
    -- messed with them before this addons loads
    CastingBarFrame_OnLoad(CastingBarFrame, "player", true, false);
    PetCastingBarFrame_OnLoad(PetCastingBarFrame);
 
    -- Create target casting bar
    CreateFrame("StatusBar", "TargetCastingBarFrame", UIParent, "CastingBarFrameTemplate");
    TargetCastingBarFrame:RegisterEvent("PLAYER_TARGET_CHANGED");
    CastingBarFrame_OnLoad(TargetCastingBarFrame, "target", false, true);
 
    -- Create focus casting bar
    CreateFrame("StatusBar", "FocusCastingBarFrame", UIParent, "CastingBarFrameTemplate");
    FocusCastingBarFrame:RegisterEvent("PLAYER_FOCUS_CHANGED");
    CastingBarFrame_OnLoad(FocusCastingBarFrame, "focus", false, true);
 
    -- Register additional events on CastingBarFrame
    CastingBarFrame:RegisterEvent("UNIT_SPELLCAST_SENT");
    CastingBarFrame:RegisterEvent("ACTIONBAR_UPDATE_COOLDOWN");
 
    -- Setup table with all frames
    self.frames = {CastingBarFrame, PetCastingBarFrame, TargetCastingBarFrame, FocusCastingBarFrame, MirrorTimer1, MirrorTimer2, MirrorTimer3};
 
    -- Customize the bars
    self:FrameCustomizeAll();