How to connect mysql database to freeradius on ubuntu 18?

Question

MySQL

Good day to all! I'm trying to connect the mariaddb database to freeradius. I do everything step by step and according to this instruction https://infoit.com.ua/linux/ubuntu/kak-ustanovit-f... .
after setting the config file /etc/freeradius/3.0/mods-enabled/sql:

sql {
driver = "rlm_sql_mysql"
dialect = "mysql"

# Connection info:
server = "localhost"
port = 3306
login = "radius"
password = "radiuspassword"

# Database table configuration for everything except Oracle
radius_db = "radius"
}

# Set to ‘yes’ to read radius clients from the database (‘nas’ table)
# Clients will ONLY be read on server startup.
read_clients = yes

# Table to keep radius client info
client_table = "nas"

after I start the freeradius service in the debug mode "freeradius -X"
and get a number of errors

rlm_sql (sql): Opening additional connection (0), 1 of 32 pending slots used
rlm_sql_mysql: Starting connect to MySQL server
rlm_sql_mysql: Couldn't connect to MySQL server [email protected]:radius
rlm_sql_mysql: MySQL error: Access denied for user 'radius'@'localhost'
rlm_sql_mysql: Socket destructor called, closing socket
rlm_sql (sql): Opening connection failed (0)
rlm_sql (sql): Removing connection pool
/etc/freeradius/3.0/mods-enabled/sql[20]: Instantiation failed for module "sql"

Has anyone encountered this problem? Or can you suggest how to solve this issue?
Thank you in advance!