I used the exact same NZB with Sab and it downloaded fine with No errors.
When i check the log file it has 0 bytes in it. I usually have 4 servers so i disabled 3 of them and just tried using one but still got the same result.
At the moment i cannot use NBP So any help in getting this fixed would be appreciated.
As an aside, how do i add an image as it would be a lot easier to see the problem than me trying to explain it.

( found a way)
https://imgur.com/a/gdMupBX
Thanks
I edited the post to put the correct error in it.