Error by building own app

Olga Syrbachova <syrba4eva28@...>

Hi! I want to create my own app. So I've followed the instructions given on the website For the beginning I just copied the src/main.c, CMakeLists.txt (here I changed the project name to "my_app") and orj.conf from zephyrproject/zephyr/samples/hello_world to Home/app. Next I ran
west build -b qemu_x86
and got an error:

ol@ol-H270M-DS3H:~$ west build -b qemu_x86 ~/app
usage: west [-h] [-z ZEPHYR_BASE] [-v] [-V] <command> ...
west: error: argument <command>: invalid choice: 'build' (choose from 'init', 'update', 'list', 'manifest', 'diff', 'status', 'forall', 'help', 'config', 'topdir', 'selfupdate')

I also tried to run this command with --pristine, but it didn't work. What am I doing wrong? Any help would be highly appreciated. Thank you in advance.

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