Hi, I have checked "locale" module and install i18n modules and upload it.po.

Now I have this problem: when submit a form I get:

user error: Duplicate entry 'locale:it' for key 1 query: INSERT INTO cache (cid, data, created, expire, headers) VALUES ('locale:it', 'a:1602:{s:10:"Navigation";s:11:"Navigazione";s:6:"blocks";s:7:"blocchi";s:4:"list";s:6:"elenco";s:15:"configure block";s:19:"configura il blocco";s:12:"delete block";s:17:"elimina il blocco";s:9:"add block";s:18:"aggiungi un blocco";s:8:"comments";s:8:"commenti";s:12:"edit comment";s:20:"modifica il commento";s:14:"delete comment";s:19:"elimina il commento";s:9:"configure";s:9:"configura";s:12:"new comments";s:14:"nuovi commenti";s:14:"approval queue";s:20:"coda di approvazione";s:8:"settings";s:12:"impostazioni";s:17:"moderation matrix";s:22:& in /home/cremonat/public_html/ziobudda/includes/database.mysql.inc on line 66.

user error: Duplicate entry 'locale:en' for key 1 query: INSERT INTO cache (cid, data, created, expire, headers) VALUES ('locale:en', 'a:1602:{s:10:"Navigation";s:11:"Navigazione";s:6:"blocks";s:7:"blocchi";s:4:"list";s:6:"elenco";s:15:"configure block";s:19:"configura il blocco";s:12:"delete block";s:17:"elimina il blocco";s:9:"add block";s:18:"aggiungi un blocco";s:8:"comments";s:8:"commenti";s:12:"edit comment";s:20:"modifica il commento";s:14:"delete comment";s:19:"elimina il commento";s:9:"configure";s:9:"configura";s:12:"new comments";s:14:"nuovi commenti";s:14:"approval queue";s:20:"coda di approvazione";s:8:"settings";s:12:"impostazioni";s:17:"moderation matrix";s:22:& in /home/cremonat/public_html/ziobudda/includes/database.mysql.inc on line 66.

Where is the error ?

Tnx.