Thanks a lot for your reply.
Yes.I connected to 9.2 database with 8.0 driver from powerbuilder.
I am able to connect using SQLPLUS too and create procedures & packages.
I downloaded filemon and tried locating the error.
I found 2 FAILURE at FASTIO_CHECK_IO_POSSIBLE & FASTIO_WRITE
I couldn't trace out what exactly this error means.I had attached the log file with this mail.
Please help me out if you are aware of this error.