by Ken Task.
Well, you've not disclosed OS nor any particulars about DB. Those are factors ... cause the error could be somewhat misleading. MySQL/MariaDB might need a tweak to max_packet_allowed and if MSSQL there is a setting similar ... see
https://moodle.org/mod/forum/discuss.php?d=345675#p1411282 for Windows/MSSQL.
'spirit of sharing', Ken