Why is SUMIF returning #DIVIDE BY ZERO error?


I have written a simple SUMIF formula to sum the parent rows in the Sheet Summary of a budget sheet.

Formula is written as =SUMIF(Parent:Parent, 1, [Budget at Completion]:[Budget at Completion])

It is giving me a #DIVIDE BY ZERO error, and I cannot figure out why. I don't have division in my formula. The data is formatted to USD in both the sheet and the summary.

Any ideas? Image attached.




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