Postgres database problem

Hi,

I am using postgresql 7.0

When i am connecting my database it is giving error

[root(at)imap /root]# su - postgres

bash-2.04$ psql GROUPSMS

NOTICE: mdopen: couldn't open /var/lib/pgsql/data/pg_log: Permission denied

NOTICE: mdopen: couldn't open /var/lib/pgsql/data/pg_log: Permission denied

psql: FATAL 1: cannot open relation pg_log

bash-2.04$ psql

psql: FATAL 1: Database "postgres" does not exist in the system catalog.

bash-2.04$ psql GROUPSMS

NOTICE: mdopen: couldn't open /var/lib/pgsql/data/pg_log: Permission denied

psql: pqReadData() -- backend closed the channel unexpectedly.

This probably means the backend terminated abnormally

before or while processing the request.

(2) When i am trying to connect via application it is giving error

[root(at)imap GroupSMS]# java SendGrpSmpp

Before Connection

W 15/10/08 18:51:34 EventLog : No log file configured

SMS JDK (tm) Version 2.2 Build $Date: 2002/05/10 10:55:06 $

Copyright (c) 2001 Noctor Consulting Limited. All rights reserved.

After Connection

Before Bind

After Bind

Polling at Wed Oct 15 18:51:34 IST 2008

Something unusual has occured to cause the driver to fail. Please report this exception: java

.sql.SQLException: NOTICE: mdopen: couldn't open /var/lib/pgsql/data/pg_log: Permission deni

ed

at org.postgresql.Driver.connect(Driver.java:125)

at java.sql.DriverManager.getConnection(DriverManager.java:517)

at java.sql.DriverManager.getConnection(DriverManager.java:177)

at SendGrpSmpp.readSMPPtable(SendGrpSmpp.java:213)

at SendGrpSmpp.run(SendGrpSmpp.java:93)

-------------------------Within Read Group-----------------------------

inside readFromTable

Something unusual has occured to cause the driver to fail. Please report this exception: java

.sql.SQLException: NOTICE: mdopen: couldn't open /var/lib/pgsql/data/pg_log: Permission deni

ed

at org.postgresql.Driver.connect(Driver.java:125)

at java.sql.DriverManager.getConnection(DriverManager.java:517)

at java.sql.DriverManager.getConnection(DriverManager.java:177)

at SendGrpSmpp.readFromTable(SendGrpSmpp.java:119)

at SendGrpSmpp.run(SendGrpSmpp.java:94)

Kindly provide solution ,as it is urgent

Regards:

Nitin Saxena