Utils/mkbootimg issues

You can download the folder ‘utils’ from our github

$ cd /home/cinesoft/project/khadas/ubuntu
$ git clone https://github.com/khadas/utils

what’s the error information about it?
I create ramdisk successfully.

terry@Server:~/project/khadas/ubuntu$ ./utils/mkbootimg --kernel linux/arch/arm64/boot/Image --ramdisk images/initrd.img -o images/ramdisk.img
terry@Server:~/project/khadas/ubuntu$ ls -l images/ramdisk.img 
-rw-r--r-- 1 terry terry 20062208 Jun 28 19:01 images/ramdisk.img
terry@Server:~/project/khadas/ubuntu$