Failed to execute backup database

[Kaos1337]

Hi,
since yesterday plesk can't make a backup of 1 of 17 site. The biggest one.
The error that I receive is from e-mail:

==================================
Object: Backup/Restore task notification
From: PMMCli-Daemon
Text:
Backup task finished on host xxxxx.

Task was created by server server with guid (e46f0feb-1b2b-4a........)


Creation date is: 2014-Oct-24 12:22:25
Task status is: error

Dump full name is: domains/xxxx/backup_xxxxxxx_info_1410241222.xml
===================================


In attachment there is this: http://pastebin.com/nXyPescr

Tell me if you need other files.
Regards.


Edit:
solved! Was a wrong database variable!