KDE - akonadi mysql error

When getting this error:

[ERROR] Can't open and lock privilege tables: Table 'mysql.servers' doesn't exist

try this:

stop akonadi
Code:
akonadictl stop

remove the db_data dir:
Code:
rm -r ~/.local/share/akonadi/db_data

recreate mysqldb with
Code:
mysql_install_db --datadir=$HOME/.local/share/akonadi/db_data/

start akonadi
Code:
akonadictl start

sources:
Arch Linux::Akonadi::MySQL errors