PostgreSQL: FATAL Error – remaining connection slots are reserved for non-replication superuser connections

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Few weeks ago, We got an error in one of our client PostgreSQL Server. Below is an error:
psql.bin: FATAL: remaining connection slots are reserved for non-replication superuser connections

The solution of above error is also very straightforward and short. You are getting this error because your server exceeded the limit of max_connections parameter.max_connection.

The solution is:

Increase the value of [max_connections] parameter:

Decrease the value of [superuser_reserved_connections] parameter:

You can find above both parameters in postgresql.conf file.
Note: After changing parameters, you must restart the PostgreSQL cluster.