The addon simply seems to be breaking the character frame window, which is a potential indirect conflict with any other addon that might interact with some elements of it : for example I experienced the absence of the disappearing of the character model preview in the character frame( no addon seems to be involved for this error ), and the disappearing of the character stats panel when Deja Character Stats is running, preventing it to provide the stats unless ABP is turned off.

I have no knowledge whether this addon is still ongoing, pending the devs to find solutions or whatever, or not, I however will leave the errors I get in the event that someone might want to troubleshoot it or provide some sort of workaround.

Firstly when I open the character frame

1x FrameXML/PaperDollFrame.lua:2668: attempt to index local 'frame' (a nil value)
[string "@FrameXML/PaperDollFrame.lua"]:2668: in function PaperDollFrame_UpdateSidebarTabs' [string "@FrameXML/CharacterFrame.lua"]:226: in function CharacterFrame_Expand'
[string "@FrameXML/PaperDollFrame.lua"]:1431: in function <FrameXML/PaperDollFrame.lua:1426>
[string "=[C]"]: in function Show' [string "@FrameXML/UIParent.lua"]:2853: in function SetUIPanel'
[string "@FrameXML/UIParent.lua"]:2696: in function ShowUIPanel' [string "@FrameXML/UIParent.lua"]:2561: in function <FrameXML/UIParent.lua:2557> [string "=[C]"]: in function SetAttribute'
[string "@FrameXML/UIParent.lua"]:3159: in function ShowUIPanel' [string "@FrameXML/CharacterFrame.lua"]:21: in function ToggleCharacter'
[string "TOGGLECHARACTER0"]:1: in function <[string "TOGGLECHARACTER0"]:1>

Locals:
(for index) = 4
(for limit) = 4
(for step) = 1
i = 4
tab = PaperDollSidebarTab4 {
0 =
Hider = Texture {
}
TabBg = Texture {
}
Icon = Texture {
}
Highlight = Texture {
}
}
frame = nil
(*temporary) = 4
(*temporary) = nil
(*temporary) =
(*temporary) = ""
(*temporary) = ""
(*temporary) = 0.781250
(*temporary) = "attempt to index local 'frame' (a nil value)"

And when I close the character frame, this error shows up

1x FrameXML/PaperDollFrame.lua:2668: attempt to index local 'frame' (a nil value)
[string "@FrameXML/PaperDollFrame.lua"]:2668: in function PaperDollFrame_UpdateSidebarTabs' [string "@FrameXML/CharacterFrame.lua"]:226: in function CharacterFrame_Expand'
[string "@FrameXML/PaperDollFrame.lua"]:1431: in function <FrameXML/PaperDollFrame.lua:1426>
[string "=[C]"]: in function Show' [string "@FrameXML/UIParent.lua"]:2853: in function SetUIPanel'
[string "@FrameXML/UIParent.lua"]:2696: in function ShowUIPanel' [string "@FrameXML/UIParent.lua"]:2561: in function <FrameXML/UIParent.lua:2557> [string "=[C]"]: in function SetAttribute'
[string "@FrameXML/UIParent.lua"]:3159: in function ShowUIPanel' [string "@FrameXML/CharacterFrame.lua"]:21: in function ToggleCharacter'
[string "TOGGLECHARACTER0"]:1: in function <[string "TOGGLECHARACTER0"]:1>

Locals:
(for index) = 4
(for limit) = 4
(for step) = 1
i = 4
tab = PaperDollSidebarTab4 {
0 =
Hider = Texture {
}
TabBg = Texture {
}
Icon = Texture {
}
Highlight = Texture {
}
}
frame = nil
(*temporary) = 4
(*temporary) = nil
(*temporary) =
(*temporary) = ""
(*temporary) = ""
(*temporary) = 0.781250
(*temporary) = "attempt to index local 'frame' (a nil value)"

Hopefully it can be of any help at all