Google Sheets: Argument cannot be null...

Hi,

I'm trying to do some coding to Google sheets, I'm doing it exactly by video tutorial, but as soon as I put argument "list" to function (applyValidationToCell) I get error: Argument cannot be Null: values. applyValidationToCell (at) Code(dot)gs:11

I do not think I need to attach sample file because it is exactly like in video and yet so far into tutorial it has nothing to do with sheet data.

video: YouTube /watch?v=s-I8Z4nTDak

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if I don't put it in call function it works:

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just like in the video
Attachment 720218

I think I fixed it my self... I chose wrong function near Debugging button. So far it works. Sorry for wasting everyone's time...