Error building buildroot for rock3a

[thefrankk]

Hi!
I'm trying to build the buildroot, i'm using Ubuntu 22.04 running on WSL, Windows 11.
And i get this error:

BINMAN .binman_stamp Wrote map file './simple-bin.map' to show errors binman: Node '/binman/simple-bin/fit': subnode 'images/@atf-SEQ': Failed to read ELF file: Python: No module named 'elftools' make[1]: *** [Makefile:1115: .binman_stamp] Error 1

I did every step from the README, but I can't make it work.

Hope any one can help me.
Thank you.