[Risolto] - Errore su Database - Non riesco più a vedere il sito

Salve,
da stasera (o forse anche prima) il mio sito domuspisa.it non è raggiungibile, o se ci provo ricevo il messaggio

Quote:

Warning: Table 'domuspisa_db.users' doesn't exist query: SELECT u.*, s.* FROM users u INNER JOIN sessions s ON u.uid = s.uid WHERE s.sid = '27a78254fac19885900c6be6025a2e02' in /var/www/vhosts/domuspisa.it/httpdocs/includes/database.mysql.inc on line 128

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /var/www/vhosts/domuspisa.it/httpdocs/includes/database.mysql.inc:128) in /var/www/vhosts/domuspisa.it/httpdocs/includes/bootstrap.inc on line 1162

Warning: Table 'domuspisa_db.cache' doesn't exist query: SELECT data, created, headers, expire, serialized FROM cache WHERE cid = 'variables' in /var/www/vhosts/domuspisa.it/httpdocs/includes/database.mysql.inc on line 128

Warning: Table 'domuspisa_db.variable' doesn't exist query: SELECT * FROM variable in /var/www/vhosts/domuspisa.it/httpdocs/includes/database.mysql.inc on line 128

Warning: Table 'domuspisa_db.cache' doesn't exist query: UPDATE cache SET data = '', created = 1309733264, expire = 0, headers = '', serialized = 0 WHERE cid = 'variables' in /var/www/vhosts/domuspisa.it/httpdocs/includes/database.mysql.inc on line 128

Warning: Table 'domuspisa_db.system' doesn't exist query: SELECT name, filename, throttle FROM system WHERE type = 'module' AND status = 1 AND bootstrap = 1 ORDER BY weight ASC, filename ASC in /var/www/vhosts/domuspisa.it/httpdocs/includes/database.mysql.inc on line 128

Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/domuspisa.it/httpdocs/includes/database.mysql.inc:128) in /var/www/vhosts/domuspisa.it/httpdocs/includes/bootstrap.inc on line 726

Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/domuspisa.it/httpdocs/includes/database.mysql.inc:128) in /var/www/vhosts/domuspisa.it/httpdocs/includes/bootstrap.inc on line 727

Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/domuspisa.it/httpdocs/includes/database.mysql.inc:128) in /var/www/vhosts/domuspisa.it/httpdocs/includes/bootstrap.inc on line 728

Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/domuspisa.it/httpdocs/includes/database.mysql.inc:128) in /var/www/vhosts/domuspisa.it/httpdocs/includes/bootstrap.inc on line 729

Warning: Table 'domuspisa_db.url_alias' doesn't exist query: SELECT COUNT(pid) FROM url_alias in /var/www/vhosts/domuspisa.it/httpdocs/includes/database.mysql.inc on line 128

ho verificato che il database esista e anche le tabelle esistano ma nulla.
Ha funzionato bene per anni, sino ad oggi.
Da cosa può essere causato??

E' Drupal 6.
In questi giorni non ho fatto nessuna modifica.

Aspetto con urgenza qualsiasi suggerimento!
Grazie