Fix a #SPILL! error in Excel

Three causes, three repairs

Use =SEQUENCE(3) as the common test. In an empty area it should fill three rows with 1, 2 and 3.

1. Occupied cell: H3 already contains STOP; replace the instruction text in H2 with the formula. Excel should display #SPILL! in H2. Select H2 to inspect the dashed spill border; clear H3 and expect H2:H4 = 1, 2, 3.
2. Inside an Excel Table: enter the formula in blank C9 of the included Excel Table. Spilled array formulas are unsupported inside tables. Move the formula outside the table and provide three empty rows.
3. Merged cell: J3:J4 are already merged; replace the instruction text in J2 with the formula. Unmerge the target area or move the formula to empty unmerged cells.

The download includes an occupied cell, a real Excel Table and a merged blocker. Enter the SEQUENCE formulas in H2, C9 and J2 to reproduce each case; H2 and J2 start as instructions while C9 is blank, so no error is prefilled. Use the described blockers to reproduce each error in Excel; formula engines can calculate the array differently, so an OOXML preview is not evidence that Excel has shown a #SPILL! dialog. Keep the original range intact until you identify the blocking cell. For a no-match FILTER result, see the FILTER example; that is a different error condition.