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Secure DFU Error: Got unexpected extra argument (private.key)

In step A1.   ( https://devzone.nordicsemi.com/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader )

nrfutil.exe keys generate private.key

I got

C:\Users\george>nrfutil keys generate private.key
Usage: nrfutil keys [OPTIONS] KEY_FILE

Error: Got unexpected extra argument (private.key)


What is the problem here ?

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