There was a problem when I tried to publish my last post. It returned an error message in the first time, I went back and tried it again. Again an error message:

"An error occurred:

Saving entry failed: Duplicate entry '2113' for key 1 "

I think the first time it failed, the message was different, but I don´t remember what it was.

Now, I can´t save any new posts - and all the old ones simply disappeared from the list of entries! The blog´s main editing menu does say it has 65 entries, but they are not listed.

What is that? Does anybody knows? How can I fix it?

Which database type are you using (Berkeley, MySQL, SQLite, or ProtegeSQL)?

Honestly, I don´t know for sure.
But I think it´s MySQL.

How do I find this out?

Check your mt.cfg file for this line:

Ok, I checked and it´s MySQL...

Well, I didn't do anything, but now the error message that's appearing when I try to post is different:

"Saving entry failed: Can't open file: 'mt_entry.MYD'. (errno: 145)"

Does anyone know what file is this?

I'm getting really worried...

This error usually pops up when there's a problem with the database files. If you have access to phpMYAdmin, use it to access the database and do a CHECK/REPAIR operation on the tables. If you don't have access, then you'll have to get someone at your host provider to do it. Gory details in the Disaster Prevention section of the MySQL manual.