Build fails at tegra-minimal-initramfs / do_image_cpio

[intera91]

Build fails with the following error:

 DEBUG: Executing shell function do_image_cpio
| 9154 blocks
| NOTE: Copying KERNEL_DEVICETREE entry tegra234-p3767-0003-p3768-0000-a0.dtb to /mnt/18/home/patrick/workspace/orin/build/tmp/work/guidance_jetson_orin_nx_specs-poky-linux/tegra-minimal-initramfs/1.0-r0/bup-payload
| NOTE: Copying overlay L4TConfiguration.dtbo to /mnt/18/home/patrick/workspace/orin/build/tmp/work/guidance_jetson_orin_nx_specs-poky-linux/tegra-minimal-initramfs/1.0-r0/bup-payload
| NOTE: Copying overlay tegra234-p3767-overlay.dtbo to /mnt/18/home/patrick/workspace/orin/build/tmp/work/guidance_jetson_orin_nx_specs-poky-linux/tegra-minimal-initramfs/1.0-r0/bup-payload
| NOTE: Copying overlay tegra234-p3768-overlay.dtbo to /mnt/18/home/patrick/workspace/orin/build/tmp/work/guidance_jetson_orin_nx_specs-poky-linux/tegra-minimal-initramfs/1.0-r0/bup-payload
| NOTE: Copying overlay L4TConfiguration-rcmboot.dtbo to /mnt/18/home/patrick/workspace/orin/build/tmp/work/guidance_jetson_orin_nx_specs-poky-linux/tegra-minimal-initramfs/1.0-r0/bup-payload
| ERR: flash variable set not defined
| ERR: flash variable set not defined
| ERR: flash variable set not defined
| ERR: flash variable set not defined
| WARNING: exit code 1 from a shell command.

Without knowing which flash variable set is not defined, that error is not very helpful

Creating Yocto very basic image for Orin NX 16GB
Branch: kirkstone

Any suggestion welcome

Thanks

[intera91]

Error located in machine conifguration file.