Error of trying to enter in the game caused by a problem in db MYSQL

[farngit]

The error of console is:
[19:52:00] [User Authenticator #4/INFO]: [AdvancedBan] An unexpected error has occurred connecting to the database
[19:52:00] [User Authenticator #4/INFO]: Check if your MySQL data is correct and if your MySQL-Server is online
[19:52:00] [User Authenticator #4/INFO]: Please check the plugins/AdvancedBan/logs/latest.log file and report this error in: https://github.com/DevLeoko/AdvancedBan/issues
[19:52:00] [User Authenticator #4/INFO]: Disconnecting ttnotblunt (/108.181.136.165:7366): [AdvancedBan] Failed to load player data!
[19:52:00] [User Authenticator #4/INFO]: UUID of player ttnotblunt is b1287382-b270-3f5e-85b7-d0ce9bc4f64d
[19:52:00] [Server thread/INFO]: ttnotblunt (/108.181.136.165:7366) lost connection: [AdvancedBan] Failed to load player data!
and the latest.log:

latest.log

[Hopefuls]

Your database has too many connections open, which causes AdvancedBan not to connect.

Increase your database connection limit and try again