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错不了

can't be wrong

→ 错
phrase Rare #26,329
can't be wrong An informal expression meaning that something is definitely correct, certain, or unlikely to go wrong. It can also be used by itself as a confident reassurance.
CH: 放心吧，这个消息错不了。
EN: Don’t worry, this information is definitely correct.

我觉得他们在树林里应该错不了

I don't think they could be lost in the woods.

— 上帝之城 (2002)

既然伊之助这麽说就一定错不了

If Inosuke says so, it must be right.

— 鬼灭之刃：无限列车篇 (2020)

错不了

It can't be wrong.

— 红猪 (1992)

错不了！

No doubt about it!

— 霸王别姬 (1993)