Undefined array key "valid_centro"
#0 /var/www/html/red/usuarios/list/demandantes_emp.php(7): devel_error_handler()
Array
(
    [errno] => 2
    [message] => Undefined array key "valid_centro"
    [file] => /var/www/html/red/usuarios/list/demandantes_emp.php
    [line] => 7
    [er] => 24565
    [shell] => 
)