Problem when building a custom board in VScode

Good Day.

I'm powering up to create my own custom board in VScode, following the "Adding Custom Board Support in nRF Connect SDK" video tutorial on YouTube.

But when building the "Hello_world" project, I get this message in the terminal (on the screenshot).

I'm using SDK v.2.5.99

What does it mean?

Can you please tell me what I should fix?

Thanks.

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