[PAC3] lua/pac3/editor/client/saved_parts.lua:256: attempt to index field 'self' (a nil value)

1. LoadParts - lua/pac3/editor/client/saved_parts.lua:256
2. DoClick - lua/pac3/editor/client/saved_parts.lua:475
3. OnMouseReleased - lua/vgui/dlabel.lua:253
4. unknown - lua/vgui/dmenuoption.lua:77

I was trying to load livery for Greenwood and Rancher from GTA 3D Universe Simfphys cars.