ERROR IN CUMULATIVE AREA FIELD IN THE TABLE IN ARCMAP

[InshaBatool]

I performed zonal stats table first then I want to add hypsometric curve in my study. For that I required a cumulative area field in table but everytime I tried , there is an error I face. I didn't detect what is the problem with the expressions I give. Can someone help me out in it. I also attached the SS files of the steps for further assistance.

[DanPatterson]

Your Type is set to String, shouldn't it be number? do you have to use a VB parser?

[InshaBatool]

Actuallly in type I use number first but that time I got same error, as an instance I change it into string.