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Three Excel errors your AI copilot will confidently tell you don't exist

This story is from 2026-09-25. It is preserved in the archive; the latest stories are on the live feed.

Three Excel errors your AI copilot will confidently tell you don't exist Over the past week I wrote up three real troubleshooting cases: a VLOOKUP throwing #VALUE! instead of #N/A, a SUMIFS silently returning 0, and a COUNTIF undercounting rows that look identical on screen. Different functions, di…

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  1. 2026-09-25 20:01 · DEV Community — AI
    Three Excel errors your AI copilot will confidently tell you don't exist

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