Web interface not working but still blocking ads

Says the file or folder does not exist.

root@DietPi:~# sudo /usr/sbin/lighttpd -D -f /etc/lighttpd/lighttpd.conf
2018-09-04 00:06:13: (log.c.171) opening errorlog '/var/log/lighttpd/error.log' failed: No such file or directory
root@DietPi:~# root@DietPi:~# sudo /usr/sbin/lighttpd -D -f /etc/lighttpd/lighttpd.conf
-bash: root@DietPi:~#: command not found
root@DietPi:~# 2018-09-04 00:06:13: (log.c.171) opening errorlog '/var/log/lighttpd/error.log' failed: No such file or directory^C
root@DietPi:~# sudo touch /var/log/lighttpd/error.log
touch: cannot touch '/var/log/lighttpd/error.log': No such file or directory
root@DietPi:~#
root@DietPi:~# sudo chmod 644 /var/log/lighttpd/error.log
chmod: cannot access '/var/log/lighttpd/error.log': No such file or directory
root@DietPi:~#
root@DietPi:~# sudo chown www-data:www-data /var/log/lighttpd/error.log
chown: cannot access '/var/log/lighttpd/error.log': No such file or directory
root@DietPi:~#
root@DietPi:~# sudo service lighttpd restart
root@DietPi:~#
root@DietPi:~# sudo service lighttpd status -l
● lighttpd.service - Lighttpd Daemon
Loaded: loaded (/lib/systemd/system/lighttpd.service; enabled; vendor preset:
enabled)
Active: failed (Result: exit-code) since Tue 2018-09-04 00:37:11 B
ST; 6s ago
Process: 16443 ExecStart=/usr/sbin/lighttpd -D -f /etc/lighttpd/lighttpd.conf
(code=exited, status=255)
Process: 16433 ExecStartPre=/usr/sbin/lighttpd -tt -f /etc/lighttpd/lighttpd.c
onf (code=exited, status=0/SUCCESS)
Main PID: 16443 (code=exited, status=255)

Sep 04 00:37:11 DietPi systemd[1]: lighttpd.service: Unit entered failed
state.
Sep 04 00:37:11 DietPi systemd[1]: lighttpd.service: Failed with result
'exit-code'.
Sep 04 00:37:11 DietPi systemd[1]: lighttpd.service: Service hold-off time over,
scheduling restart.
Sep 04 00:37:11 DietPi systemd[1]: Stopped Lighttpd Daemon.
Sep 04 00:37:11 DietPi systemd[1]: lighttpd.service: Start request repea
ted too quickly.
Sep 04 00:37:11 DietPi systemd[1]: Failed to start Lighttpd Daemon.
Sep 04 00:37:11 DietPi systemd[1]: lighttpd.service: Unit entered failed
state.
Sep 04 00:37:11 DietPi systemd[1]: lighttpd.service: Failed with result
'exit-code'.
root@DietPi:~# sudo stat /var/log/lighttpd
stat: cannot stat '/var/log/lighttpd': No such file or directory
root@DietPi:~# Access: (0750/drwxr-x---) Uid: ( 33/www-data) Gid: ( 33/www-data)
-bash: syntax error near unexpected token `0750/drwxr-x---'