How to Fix Excel LAMBDA #NAME? Error Caused by ISOMITTED Typo
Question details
The user is encountering a #NAME? error when using a custom LAMBDA formula in Excel due to a misspelling of the ISOMITTED function.
- Product
- Microsoft Excel
- Device & OS
- not provided
- Scenario
- Building complex custom formulas using LAMBDA, LET, and dynamic array functions like VSTACK and HSTACK.
- Observed behavior
- The formula returns a #NAME? error because Excel does not recognize the misspelled function name 'ISOMMITED'.
Ensure your version of Microsoft Excel (Microsoft 365) supports advanced functions like LAMBDA, LET, ISOMITTED, VSTACK, and HSTACK, as older versions will return a #NAME? error regardless of perfect spelling.
Correct the ISOMITTED Function Typo
The most common cause for this specific #NAME? error is spelling 'ISOMITTED' incorrectly with a double 'M' instead of a double 'T'.
Excel relies on exact syntax for function names. When wrapping functions inside a LET or LAMBDA statement, a single typo in helper functions like ISOMITTED will break the entire calculation and throw a #NAME? error.
Select the cell containing your custom LAMBDA formula that is displaying the #NAME? error.
Click into the formula bar at the top of the screen and carefully read through your LET and LAMBDA function definitions.
Find the text 'ISOMMITED' and change it to the correct spelling 'ISOMITTED'.
Press Enter to apply the fix. The formula should now calculate correctly assuming all other arguments and variable names match.
Verify Microsoft 365 Version Compatibility
If you are absolutely certain the spelling is correct but the error persists, your Excel version might not support these dynamic array functions.
Edit and Audit Formulas Effectively in WPS Spreadsheet
WPS Office offers a robust Spreadsheet tool with built-in formula auditing to help you spot typos and syntax errors quickly. You can easily fix #NAME? errors using its highly compatible and intuitive interface.
- 1. Open your workbook: Launch WPS Spreadsheet and open your .xlsx file containing the faulty formula.
- 2. Use the Error Checking tool: Navigate to the Formulas tab and click on 'Error Checking' to automatically jump to the cell with the #NAME? error.
- 3. Edit the function: Click the Formula Bar, correct the spelling from ISOMMITED to ISOMITTED, and press Enter to recalculate.
Frequently Asked Questions
Why does Excel show a #NAME? error?
The #NAME? error occurs when Excel cannot recognize text in a formula. This usually happens due to misspelled function names (like typing ISOMMITED instead of ISOMITTED), undefined named ranges, or missing quotes around text strings.
Is the ISOMITTED function available in older versions of Excel?
No, the ISOMITTED function, along with LAMBDA, is only available in Microsoft 365 subscriptions and Excel for the Web. Older standalone versions like Excel 2019 or Excel 2016 will return a #NAME? error because the function does not exist in their library.
How do I troubleshoot complex LAMBDA functions?
Break down your LAMBDA function into smaller parts using the LET function. Test each variable and helper function step-by-step in the worksheet before wrapping them all into a single, complex LAMBDA formula.
