GameObject doesn't work, pls help

Hi guys, I’m very newbie and I don’t know what to do with this problem. I make some Bolt scheme which goal is to choose some object on desk and return mouse coordinates, but when I try to run it I have next notification: "Invalid operation exception: Missing target object for ‘UnityEngine.GameObject.gameObject’
Pls help me, screenshots attached

Bump

This looks like it might be visual scripting. You might find more help in that forum:

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Thanks, I’ll try