Hi all,
on top of the list. The textfile should be as follows:
Interesting that works, thanks for sharing 
We are aware of this issue and looking to resolve it for v145. It appears Debian has changed their webserver configuration over night and now requires a / at the end of url entries:
https://github.com/Fourdee/DietPi/issues/755#issuecomment-282203823
A quick solution is to exit DietPi-Software and select another APT mirror:
dietpi-config > Networking Options: NAS/MISC > Apt Mirror