I'm assuming you are talking about my most recent code and that you omitted the comment on line #1, so your line #13 is my line #14, in which case that error is occuring because no frame named "TimerTrackerTimer1" exists at the time the code is running.
Double-check the frame name. If it is not actually "TimerTrackerTimerN" then simply correcting the names in the list should resolve the issue. If the name is correct, then it must not be created yet at login, so you would need to either (a) more extensively modify the layout to detect when the timer bars are created, and skin them at that time, or (b) figure out which Blizzard_* addon creates the timer bars and force it to load at login.
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