It looks like you are using FSA Status for the count and also as a column header. As per the message you are getting, you cannot use any field in the data area and another area if you have a calculated item. Is there another field you can use for the count?

I tried to use another field, but doesn't help. Is there another way to count two columns in Pivot Table?

You could just group the items? Or create an additional column in the source data that returns the same name for both items you want grouped.