Rockpi4 android11 error build

Hi
https://wiki.radxa.com/Rockpi4/rockpi-android11
I get error, why?

Generate images

radxa:rock-android11 $ rm -rf rockdev
radxa:rock-android11 $ ln -s RKTools/linux/Linux_Pack_Firmware/rockdev .
radxa:rock-android11 $ ./mkimage.sh

kernel image not fount![…]