TOTALFLOAT returns #INVALID VALUE

Hi,

I'm trying to use the TOTALFLOAT function to find the slack in my schedule from the critical path. I have dependencies enabled. The formula is =TOTALFLOAT([Task Name]@row). Task Name is my primary column. However, it won't return a value, just the #INVALID VALUE error. I baselined my schedule already but it shouldn't have an effect. What am I doing wrong?

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