#Invalid Operation error with simple Index formula.
I am getting an #Invalid Operation error with a really simple index formula.
=INDEX(Contract:Contract, 2)
This formula is in a Sheet Summary field. The summary field is text/number and the column referenced is a text/number column with a column formula that produces numbers. The column has the Currency formatting on, but I have tried turning it off  just in case. The [Contract] column is a real column, there is definitely more than 1 row, so 2 as a row index should work.
I have tried the same Index formula with a different column in the sheet and had it work fine.
I have this same formula (in a more complex form) on many other sheets that are (like this one) based off the same template and all work fine.
For some reason, on this one sheet, it just gives me #Invalid Argument error. What am I missing?
Answers

That's pretty weird, I can't replicate the error. A few things to try/check:
Delete the sheet summary field and recreate it.
Check your browser version to make sure it's updated.
Try the same formula in a nonsummary field.
Regards,
Jeff Reisman, IT Business Analyst & Project Coordinator, Mitsubishi Electric Trane US
Link: Smartsheet Functions Help Pages Link: Smartsheet Formula Error Messages
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