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Fix the #VALUE! error in Excel date subtraction in minutes. Real-world causes, hidden text-date bugs, and the DATEVALUE workaround that actually works.

Recover from #REF! errors in Google Sheets after deleting columns. Real fixes, version history rollback, and the INDIRECT trick that prevents future breaks.

VLOOKUP returning #N/A when the value is clearly there? Six hidden causes — including trailing spaces, mixed data types, and the CHAR(160) trap — with fixes.

Fix #NUM! errors in Excel IRR calculations. Real causes — guess parameter, sign convention, no-solution scenarios — and the MIRR alternative that always works.

Eliminate #DIV/0! errors in Excel without distorting your data. IFERROR vs IF vs ISERROR — when to use each, and the hidden pitfall that breaks pivot tables.

Fix #NAME? errors in Excel custom VBA functions. Trust Center settings, module placement, name collisions, and the digital signature trap that breaks UDFs.

Fix Excel #NULL! errors caused by intersection operator mistakes. The space-as-operator trap, named range overlaps, and when SUMPRODUCT solves it cleanly.

Fix Excel 365 #SPILL! errors instantly. Blocked cells, merged-cell traps, and the hidden table-conversion trick that no Microsoft Learn article shows.

Fix Excel #CALC! errors in nested FILTER formulas. Empty array results, the if_empty argument, and the lambda trick that prevents cascading failures.