Build issue with kvim3/bootloader.img no known rule to make itandroid pi in vim3

VIM3
1

ninja: error: ‘device/khadas/kvim3/bootloader.img’, needed by ‘out/target/product/kvim3/bootloader.img’, missing and no known rule to make it
09:51:49 ninja failed with: exit status 1

2

@Pradeep_Kumar_Upadhy

cd /bootloader/uboot
./mk kvim3
cd -
source build/envsetup.sh
lunch kvim3-userdebug
make installclean
make -j36 otapackage