Trouble reinstalling anything to my Macintosh HD on my Mac

I recently wiped my Mac and erased the HD drive as I was preparing to move countries and needed to post my Mac. I followed the online guide and signed out of everything and De authorised my iTunes account. Then restarted and booted Disk Utility using command +r. After the successful wipe I had to get to the post office so didn’t reinstall macOS Sierra just thinking I’d do it once/if it arrived.

it arrived yesterday so booted with command +r and opened disk utility

i couldn’t boot from time machine backup

i can’t seem to just reinstall Mac OS Sierra either as it says an error occurred while preparing the installation

Any one got any ideas