Problem with connection to mysql database configured no more goes up

Question

I’m trying to upload a local system but it’s not connecting to the database. I’ve already made the settings. I’ll leave the error below if anyone can help me thank.

here and the configuration in the database

line 124 code

    // Connect to the database and set the connection ID
    $this->conn_id = ($this->pconnect == FALSE) ? $this->db_connect() : $this->db_pconnect();

    // No connection resource?  Throw an error
    if ( ! $this->conn_id)
    {
        log_message('error', 'Unable to connect to the database');

        if ($this->db_debug)
        {
            $this->display_error('db_unable_to_connect');
        }
        return FALSE;
    }