SE30 Error

hi all,

today i just ran a report for runtime analysis on SE30 and i got an error saying

"Unable to end the measurement (error number 5, Error when measuring)"..

what does this error mean?

its not an exceeded time limit error as its getting over by 10-15 mins...

as a result i m not able to track the performance issues with the report..

kindly guide me how to solve this issue... i tried viewing the file generated from report run.... but it was not the proper analysis...

kindly help