Understanding “evaluate”

I have a problem. I am currently working in Grasshopper with the help of a tutorial. Successfully until yesterday….
Unfortunately, I can not understand the “evaluate” component. It should should generate a list of numbers decreases until zero and then increases again after zero, the expected result of the function X². Do you have an idea what I’m doing wrong? Or is that a bug of the tutorial?

Its kind of a bug when displaying Components with full variable names. You’ll need to rename the parameter from “Variable x” to “x” (or any other name without a space within).

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Thanks a lot. Now it is working.
Ich was searching for that mistake a looooong time…