my pihole is running from my vps/vpn server,, after upgrading from v4.4 I got this error..I cant add any group/client blacklist/whitelist,,thankss
Please either clear the cache on your browser or force reload the page with ctrl+F5, that should stop the error
Do you see any errors in
sudo cat /var/log/lighttpd/error.log?
Something is not correct (besides the error) as the status "lights" are all white.
You could also try to restart lighttpd
systemctl restart lighttpd.service
[Wed May 13 11:29:53.194411 2020] [:error] [pid 28101] [client XX.36.62.XXX:13300] PHP Notice: Use of undefined constant SQLITE3_OPEN_READWRITE - assumed 'SQLITE3_OPEN_READWRITE' in /var/www/html/admin/scripts/pi-hole/php/groups.php on line 24, referer: https://dns.mydomain.xyz/groups.php
[Wed May 13 11:29:53.199639 2020] [:error] [pid 28101] [client XX.36.62.XX:13300] PHP Fatal error: Class 'SQLite3' not found in /var/www/html/admin/scripts/pi-hole/php/database.php on line 42, referer: https://dns.mydomain.xyz/groups.php
pihole runs with apache2
Do you have php-sqlite3 installed?
sudo apt install php-sqlite3
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PHP Notice: Use of undefined constant SQLITE3_OPEN_READWRITE - assumed 'SQLITE3_OPEN_READWRITE' in /var/www/html/admin/scripts/pi-hole/php/groups.php on line 24, referer: https://dns.XX.xyz/groups.php
[Wed May 13 11:41:00.476481 2020] [:error] [pid 1747] [client 51.36.62.XX:25594] PHP Fatal error: Class 'SQLite3' not found in /var/www/html/admin/scripts/pi-hole/php/database.php on line 42, referer: https://dns.XX.xyz/groups.php
I install it and npw with new error logs
Restart lighthttpd
systemctl restart lighttpd.service
I know.. but I thought that were logs of /var/log/lighttpd/error.log and apache was installed additionally 
Then restart apache
I restart apache2 but same
for some reason . apache2 is running with diffent group not www-data ..but I already add pihole user to that apache group..Will that cause this error??I dont have any errors when changing setting on settings panel.only in groups/blacklist/whitelist panel
My last idea is
Your apache-user must be part in the pihole group, not vice-versa.
To check for the apache user
apachectl -S
ps aux | egrep '(apache|httpd)'
Otherwise some else (with apache knowledge) has to dig further.
Good luck.
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I dont have an issue before this upgrade , I just assign pihole user to my apache group before..anyway the first error where missing php5.6 sqlite3 since im using php5.6,,so I install sqlite3 package..but know the error is this
Error, something went wrong!
While executing: attempt to write a readonly database
Added 0 out of 1 groups
Permissions may now be broken on the database. Try renaming or removing /etc/pihole/gravity.db and allowing pi-hole to create a new one with pihole -g
Thanks I solve this problem with :
chown u+w gravity.db
chown g+w gravity.db
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Or that!
well after updating gravity.db ,, there's error again, I recheck it and it was back to pihole owner and group..so I chmod it again to my apache group.. 
Hmm OK, sorry I can't be much more help in this situation. I've never used apache before.
I have seen a couple of apache issues fixed by installing php-sqlite3, but don't take my word for that as I have no way to verify it other than anecdotal evidence.
Perhaps a community member would like to put together a guide for running Pi-hole behind Apache and submit it to our docs repo...
a simple solution is to add apache user to pihole group..as mention previously by yubiuser..and installing php5.6 sqlite3 if they have php 5.6 version..