Connected nodes but they did not work?

hello, I just start to learn dynamo.
I was doing exercixe" 06 ComputationalLogic2" on dynamo website, but when I connected the nodes they did not work. It was working few hours ago.
It is a really simple question bit I don’t even know how to search it, if you can help me I will be really greatful : )

Hi @yuioplkl1945,

Welcome to the Dynamo community.

Can you please confirm if the Run mode is set to Automatic?
(in the box at the bottom left corner of your Dynamo window)

In case if it has been set to Manual, you need to hit the Run button every time you wish to run the graph or change it back to Automatic.

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yes I tried automatic and manual, but it did not work.