Error while ./run.sh

[Phutare]

Hello, sort of new to this but i cannot figure out why i keep getting this error while trying to build the WSA Output

Create system images
mk_image_umount: /tmp/wsa-build-0fAw4TesqC_/system_root_merged/vendor /tmp/wsa-build-0fAw4TesqC_/wsa/x64/vendor.img /tmp/wsa-build-0fAw4TesqC_/upper/vendor ext4
ERROR: Not yet implemented
Build: an error has occurred, exit

Any help would be greatly appreciated! Thank you!