unable to export database from postgres

Hi

I have a database in that i have 2 schema's
 1.myschema
 2.public  (it does not contains data)

All my database tables, views and functions are in adempiere schema

When i Export the database it gives 0 bytes dump.sql.gz file

the database structure look like

http://postgresql.1045698.n5.nabble.com/file/n3323398/postgres.png





please help me

thanks in advance
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