Hello Venkat,
What is the error or warning message your getting.
The possible warning messages:
1. No records that correspond to these search criteria found --- means you have on the system Trace in different Application Server
2. 0 Records read --- means
1.In user Name field check whether you given correct name of the user. because by default your id will get filled there.
2.From and to date or time are incorrect .
3. Before activating the Trace did you check the Authorization Check
Regards
Kiran.S