UnitDetector

Error while running the chunk
  [string "Mods/Addons/UnitDetector/UnDetector.lua"]:185: attempt to index local `wtDonor' (a nil value)
  func: ?, ?, line: -1, defined: C, line: -1, [C]
    func: CreateWidgets, method, line: 185, defined: Lua, line: 95, [string "Mods/Addons/UnitDetector/UnDetector.lua"]
      func: Init, method, line: 400, defined: Lua, line: 399, [string "Mods/Addons/UnitDetector/UnDetector.lua"]
        func: ?, ?, line: 63, defined: Lua, line: 61, [string "Mods/Addons/UnitDetector/UEvRe.lua"]