OperationalError while using postgresql through python

Hi,

Python throws OperationalError while trying to do any database operations. I am using pgdb module.

error code:

raise OperationalError, "internal error in '%s': %s" % (sql,err)
pg.OperationalError: internal error in 'INSERT INTO table_book

i am not able to do any database operations apart from opening Conection and assaigning cursor object.

how do i solve this. pls help

Thanks in advance

Bijoy