SRM Portal runtime error

Hi SRM Experts,

I log-in to SRM Portal and getting following error message

Portal runtime error.

An exception occurred while processing your request. Send the exception ID to your portal administrator.

Exception ID: 11:40_11/04/13_0007_698927750

Refer to the log file for details about this exception.

not sure where & how to check the log file.

Also i want to know how i can run TRACE in portal

Please help me

Swapna