cannot read boot.elf : File not found

[wudehua2016]

I used this repo to flash the bin into the kintex-7, following the instructions on the repo. But fails after I flash the img into the sdcard. It say "RISC-V 64, BOOTROM V3.8: cannot read boot.elf: File not found " from the Serial port.
I used the kintex-7 fpga, ubuntu 20.04.
the mk-sd-card scripts was encountered a error:
This disk is currently in use - repartitioning is probably a bad idea. Umount all file systems, and swapoff all swap partitions on this disk. Use the --no-reread flag to suppress this check.
to deal with this error, I added a new flag of "--no-reread" in the sfdisk like that:

case "$response" in
[yY][eE][sS]|[yY])
sudo dd if=$SD_IMG of=$DEVICE bs=64K status=progress
sudo sync
sudo partprobe ${DEVICE}
sleep 3
echo ", +" | sudo sfdisk -N 2 ${DEVICE} --no-reread
sudo partprobe ${DEVICE}
sudo fsck -f ${DEVICE}2
sudo resize2fs ${DEVICE}2
sudo sync
break
;;
*)

and then I got the error of "cannot read boot.elf : File not found", and how can I get rid of it? Thank you

[wudehua2016]

it is my fault, i find the reason