RK3288编译android5.1系统失败这是哪里的问题啊

按照文档

代码更新后，编译reload内核

成功之后编译系统

执行到 ./ mkimage.sh 时报错

sun@sun-virtual-machine:~/android/firefly5.1$ ./mkimage.sh
TARGET_PRODUCT=rk3288_box
TARGET_HARDWARE=rk30board
IMG_TARGET=all , ota = withoutkernel
system filesysystem is ext4
‘kernel/arch/arm/boot/zImage’ -> ‘/home/sun/android/firefly5.1/out/target/product/rk3288_box/kernel’
create boot.img without kernel... done.
create recovery.img with kernel and with out resource... done.
create misc.img.... done.
create system.img... ls: cannot access /home/sun/android/firefly5.1/out/target/product/rk3288_box/system.img: No such file or directory
./mkimage.sh: line 132: [: -gt: unary operator expected
Please make first!!!

求助，这是哪里的问题啊