Kirkstone Build fail

I am trying to build Kirkstone (imx8m plus) inside the docker following the instructions at GitHub - SolidRun/meta-solidrun-arm-imx8 but the build keeps failing

“Can’t find default configuration “arch/…/configs/imx8mp_solidrun_defconfig”!”

WARNING: linux-imx-5.15.71+gitAUTOINC+95448dd0dc-r0 do_kernel_metadata: [NOTE]: defconfig was supplied both via KBUILD_DEFCONFIG and SRC_URI. Dropping SRC_URI defconfig
WARNING: linux-imx-5.15.71+gitAUTOINC+95448dd0dc-r0 do_kernel_configme: [NOTE]: defconfig was supplied both via KBUILD_DEFCONFIG and SRC_URI. Dropping SRC_URI defconfig
ERROR: u-boot-imx-2020.04-r0 do_configure: oe_runmake failed
ERROR: u-boot-imx-2020.04-r0 do_configure: ExecutionError(‘/home/build/work/imx8mp/imx-yocto2/build-fsl-imx-xwayland-imx8mpsolidrun/tmp/work/imx8mpsolidrun-poky-linux/u-boot-imx/2020.04-r0/temp/run.do_configure.1311507’, 1, None, None)
ERROR: Logfile of failure stored in: /home/build/work/imx8mp/imx-yocto2/build-fsl-imx-xwayland-imx8mpsolidrun/tmp/work/imx8mpsolidrun-poky-linux/u-boot-imx/2020.04-r0/temp/log.do_configure.1311507

ERROR: Task (/home/build/work/imx8mp/imx-yocto2/sources/meta-solidrun-arm-imx8/recipes-bsp/u-boot/u-boot-imx_2020.04.bb:do_configure) failed with exit code ‘1’