reTerminal yocto build fails

Hello,

I am following the guide https://wiki.seeedstudio.com/reTerminal-Yocto/#compile-yocto-source-code but it fails on

MACHINE=“seeed-reterminal” bitbake rpi-test-image

I get:

ERROR: No recipes in default available for:
/home/xxx/reterminal-yocto/layers/meta-seeed-cm4/recipes-kernel/linux/linux-raspberrypi_6.12.bbappend

I tried first as explained in the wiki with branch dunfell, afterwards started again with kirkstone, but I always end up with the same failure. Am I missing something?