Hello fellow tinkerers,

Struggled some time to get pihole working. In the browser, got constant JSON messages:

DataTables warning: table id=groupsTable - Invalid JSON response. For more information about this error, please see http://datatables.net/tn/1

1 Answer 1


In my case, it turned out to be an easy fix.

apt install php-sqlite3 
a2enmod proxy_fcgi setenvif 
a2enconf php7.3-fpm 
systemctl restart apache2

I am running Buster on PHP 7.3. on a Raspberry Pi 2 Model B Rev 1.

Since I am running Apache in stead of default lightpd I also needed to add www-data to the pihole group, else you get the 'SQLite readonly database' error

more /etc/group | grep hole 
more /etc/gshadow | grep hole 

Hope this helps others too.

  • Please mark the answer as the accepted one with a click on the tick on its left side. That prevents your Question from being shown as an unsolved Post to the community and saves them/us a lot of work.
    – Ingo
    Commented Nov 29, 2020 at 2:48

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