FATAL ERROR: command exited with status 1. While following nRF Connect SDK Fundamentals to build Blinky sample.

I'm a beginner to nRF52840 board, and I'm currently doing the nRF Connect SDK Fundamentals. But I failed to build the Blinky Sample due to the following error:

I'm sure that I correctly installed the toolchain and SDKs.

Can anyone help me to fix it?

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