help

Hello.

Can you help me? i don't know what to do with this message:

**********************************************************************************************
# pg_dump -U postgres catalog
Password:
pg_dump: query to obtain list of schemas failed: ERROR:  more than one
row returned by a subquery used as an expression
***********************************************************************************************

And i don't know why but there are dumplicate schemas:

***********************************************************************************************
# psql -U postgres template1
Password:
Welcome to psql 7.4.17, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help on internal slash commands
       \g or terminate with semicolon to execute query
       \q to quit

template1=# \dn;
        List of schemas
        Name        |  Owner
--------------------+----------
 information_schema | postgres
 information_schema | postgres
 pg_catalog         | postgres
 pg_catalog         | postgres
 pg_temp_1          | postgres
 pg_temp_1          | postgres
 pg_toast           | postgres
 pg_toast           | postgres
 public             | postgres
 public             | postgres
(10 rows)

template1=# \q
*************************************************************************************************

How can make Backup of my database ???

thx.
Oleg