Error actualización Plesk: Unable to set up default locale

ERROR: PleskFatalException
Unable to create Session object: Unable to set up default locale: default locale does not exist or undefined.

0: common_func.php3:95
psaerror(string 'Unable to create Session object: Unable to set up default locale: default locale does not exist or undefined.')
1: auth.php3:186

[root@s91839123 ~]# mysql -u admin -p psa
Enter password:
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 83
Server version: 5.0.45 Source distribution

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> select * from locales;
+-------+--------+
| id | active |
+-------+--------+
| de-DE | true |
| en-US | true |
| es-ES | true |
| fr-FR | true |
| it-IT | false |
| ja-JP | false |
| nl-NL | false |
| ru-RU | false |
| zh-CN | false |
| zh-TW | false |
+-------+--------+
10 rows in set (0.00 sec)

mysql> select * from misc where param like "%locale%";
+--------------+-------+
| param | val |
+--------------+-------+
| admin_locale | es-ES |
| def_locale | es-ES |
+--------------+-------+
2 rows in set (0.00 sec)

mysql> UPDATE misc SET val = "en-US" WHERE param like "%locale%";
Query OK, 2 rows affected (0.04 sec)
Rows matched: 2 Changed: 2 Warnings: 0

mysql> select * from misc where param like "%locale%";
+--------------+-------+
| param | val |
+--------------+-------+
| admin_locale | en-US |
| def_locale | en-US |
+--------------+-------+
2 rows in set (0.00 sec)

mysql>