ERROR: PleskMainDBException DB query failed: Unknown error 0

[AlexeyY]

Warning: db_query() [<a href='function.db-query'>function.db-query</a>]: Couldn't fetch mysqli in C:\Program Files\Parallels\Plesk\admin\plib\common_func.php3 on line 229



Warning: db_query() [<a href='function.db-query'>function.db-query</a>]: Couldn't fetch mysqli in C:\Program Files\Parallels\Plesk\admin\plib\common_func.php3 on line 229

ERROR: PleskMainDBException

DB query failed: Unknown error



Additionally, an exception has occurred while trying to report this error: PleskMainDBException

DB query failed: Unknown error



0: plib\common_func.php3:243

db_query(string 'set names utf8')

1: plib\common_func.php3:649

reconnect()

2: plib\common_func.php3:614

db_connect()

3: plib\head.php3:58

get_current_logo_id()

4: htdocs\top.php3:26

Howto fix this?

Plesk reconfigurator didn't help us.

W2003

Plesk 8.6.0.5 for windows

DB provider for plesk is Mysql (local) DB