Formula problem

Hi! Before I start, I want to say that I'm still fairly new with formulas, so it's very very possible that this error just might need a slight fix, but I need a bit more assistance with what I'm specifically doing wrong here to get a better grasp of formulas.

I'm trying to get a sum of how many tasks my vendor has completed, and it's under the column 'Project Risk', and it's a traffic light symbol system. I would like my final answer to populate in a previous column named: 'Formula' and for it to only show in the 49th row of this column. My arguement is as this:

=SUMIF([Project at Risk]1:[Project at Risk]49, "Green", Formula49)

I keep getting an 'INCORRECT ARGUEMENT' and I'm not sure what I'm doing wrong. Does anyone mind assisting?

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