The error/mistake/blunder are probably just when a single move loses more than x centipawns. Let's assume -0.2 centipawns for inaccuracies. Then 0 inaccuracies just means, that the player made no move worse than losing 0.2 centipawns. But if you always find that move losing 0.19 centipawns, you will eventually lose the game also.
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