ERROR : connection failed

ERROR : selectdb failed

ERROR :
MYSQL-ERROR :
FILE : /var/www/vhosts/default.balmesiana.org/e-aquinas.net/inc/class.hemeroteca.php : 101
SELECT id_revista FROM revistae WHERE publica=1  ORDER BY epoca DESC, annus DESC, numerus DESC LIMIT 1 

Revista e-aquinas.