Looks like some API calls / features were updated on Blizzard's side.

13x TrackingEye/TrackingEye.lua:81: attempt to index global 'MiniMapTrackingFrame' (a nil value)
[string "@TrackingEye/TrackingEye.lua"]:81: in main chunk

Locals:
SimpleTrackingEye =

{
}
minimapButton = SimpleTrackingEyeButton {
PixelSnapDisabled = true
}
menuFrame = SimpleTrackingEyeMenu {
Text = SimpleTrackingEyeMenuText {
}
Icon = SimpleTrackingEyeMenuIcon {
}
Button = SimpleTrackingEyeMenuButton {
}
Right = SimpleTrackingEyeMenuRight {
}
Middle = SimpleTrackingEyeMenuMiddle {
}
Left = SimpleTrackingEyeMenuLeft {
}
}
trackingSpells = {
1 = 1494
2 = 19883
3 = 19884
4 = 19885
5 = 19880
6 = 19878
7 = 19882
8 = 19879
9 = 5225
10 = 5500
11 = 5502
12 = 2383
13 = 2580
14 = 2481
}
overlay = Texture {
PixelSnapDisabled = true
}
(*temporary) = nil
(*temporary) = nil
(*temporary) = "OnEvent"
(*temporary) = nil
(*temporary) = -2.747082
(*temporary) = 0.615661
(*temporary) = 2.478368
(*temporary) = 0.615661
(*temporary) = 2.478368
(*temporary) = false
(*temporary) = "attempt to index global 'MiniMapTrackingFrame' (a nil value)"