According the discussion, there is a compression issue before 0.13.8, but Farmbot used 0.5.x for development. Therefore I decided to use the newest version. By modify the following file, we’ll be able to skip the problem.
open ~/farmbot/os/scripts/clone_system.sh and mark line 14
./scripts/build_firmware.sh rpi3
./scripts/clone_system.sh rpi3
./scripts/build_system.sh rpi3
./scripts/build_release_images.sh rpi3 5.0.6
# ./scripts/sign_release.sh # skip for now
# git checkout $NERVES_SYSTEM_BR_COMMIT