Getting a strange error using the panel to aggregate numbers

Hi folks I am getting some strange errors while imputing numbers through panels. This is going to sound vague but what am I doing wrong this seems like it should work it should be simple right?

1: 1. Solution exception:GH_String cannot be cast to System.Double

2: 1. Differences can only be computed for integers, numbers, points and vectors

use the number node

OMG I am such a fool thank you.

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