What you will build

Reproduce the array result expansion errors case on a small table, identify the cause, and verify the corrected formula or input returns the expected result.

Learning objectives

Open the practice workbook

HANDS-ON PRACTICE

Practice in your own copy

Make your own Google Sheets copy with the same data, formulas, formatting, filter and frozen header. The original remains unchanged.

Make a Google Sheets copy (access required) ↗View original

Sign in to Google. If the original is not publicly shared, download the full workbook and import it into Google Sheets, or paste the example data into your own sheet.

Sample data

SourceBlockerBroken arrayFixed array
1
2block
3

C3 intentionally contains “block” to obstruct the spill range of the formula entered in C2. D2:D4 are left empty for the corrected example.

The practice workbook shows the clean sample before formulas are entered; C3 contains block and D2:D4 are empty.

Hands-on practice

Step 1: Inspect C3 and confirm the text block occupies a cell that the C2 array needs for its spill range.

Step 2: Enter =SEQUENCE(3) in C2. The array cannot expand through C3, so C2 must return #REF!.

Step 3: Compare with =SEQUENCE(3) in D2 where D2:D4 are empty; the values 1, 2, 3 should spill successfully. Remove blockers rather than copying the array formula down row by row.

=SEQUENCE(3)
Cell C2 is selected after entering =SEQUENCE(3); the formula bar shows the formula and the cell returns #REF! because C3 blocks the spill range.

Enter the formula in D2.

=SEQUENCE(3)
Cell D2 is selected with =SEQUENCE(3); the array spills successfully through D2:D4 as 1, 2, 3.

Checkpoint

SourceBlockerBroken arrayFixed array
1#REF!1
2block2
33

Verified live in Google Sheets: C2 returns #REF! because C3 is occupied, while D2:D4 spills as 1, 2, 3.

Common mistakes and fixes

Correction: return to the exact range and command named in the steps, then compare the live sheet with the Source, Blocker, Broken array, Fixed array source fields.

Independent practice

Add one row with the same schema, repeat the action, verify the new row behaves correctly, then remove it to restore the sample.

Key takeaways

  • ✓Reproduce the array result expansion errors case on a small table, identify the cause, and verify the corrected formula or input returns the expected result.
  • ✓Inspect C3 and confirm the text block occupies a cell that the C2 array needs for its spill range.
  • ✓Enter =SEQUENCE(3) in C2. The array cannot expand through C3, so C2 must return #REF!.
  • ✓Keep the broken example visible while testing the correction. If the fixed cell still errors, compare references and input types instead of typing a replacement value over the formula.
  • ✓Add one row with the same schema, repeat the action, verify the new row behaves correctly, then remove it to restore the sample.
QUICK CHECK

Check your understanding

Answer four questions about the practice sheet.

1. What is the correct first action in “Fix array result expansion errors”?
2. Which follow-up action belongs to “Fix array result expansion errors”?
3. What should you verify before “Fix array result expansion errors” is complete?
4. Which correction is appropriate if “Fix array result expansion errors” behaves unexpectedly?

Next lesson

Continue the troubleshooting sequence with formula separators and locale-specific syntax.

Next: Fix wrong formula separators ↗