If there is error when you try to launch freeRADIUS with sudo freeradius -X

/etc/freeradius/sql.conf[22]: Instantiation failed for module "sql"

 Then You have altered your mySQL tables from daloRADIUS but with wrong version.

For freerad Version 2.x.x use mysql -u root -p -h localhost radiusdb < fr2-mysql-daloradius-and-freeradius.sql

As for freerad Version 1.x.x use mysql -u root -p -h localhost radiusdb < fr1-mysql-daloradius-and-freeradius.sql

 If you have just altered the Version1 or 2 sql schema to work with the other version your dalioRADIUS will not work and will not give error except Premission Denied when u click side menu items.

To fix it drop all the tables and import from /var/www/dalioradius.z-.x.c/contrib/db/your-version-and-schema.sql