• Completes all tests but then 'ErrUchIsDown'

I would like to give some feedback about ...

From: https://checkio.org/mission/open-labyrinth/solve/


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My solution solves all the problems but once complete the little arrow animation completes half its path then blinks back to the start, repeats 3-4 times then I get 'ErrUchIsDown' displayed in the console and the arrow completes the full path but no recognition and perpetual loading.