I am creating ledger but
I get message,
You have encountered an unexpected error. Please contact the System Administrator for assistance.
This message appear any time, where can i see the log? once i refresh the page the activity complete for which i get the message.
I am using Oracle LInux 6.

This kind of message may not have a log available. Next time you get this message try taking a screen shot. I will then try to find out if there is any common bug affecting your work. Normal messages are user friendly and give you more information. Messages like the one you are getting may be a result of some kind of a glitch or a defect.
Just in case do run "Program - Generate General Ledger Flexfield" from GL responsibility for your chart of account, before proceeding further.