Generative design - output node type is not supported - must be integer or float

I am experimenting with generative design when I choose the Watch node in the image as output I get an error saying that the node is not supported since it’s not an integer or float. The type is Int64. What am I doing wrong? Thanks!

EDIT: lists are not supported so I guess I need to convert the list to a number.

Solved. Just needed to get item from list (first item node worked fine).

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