Suresh,
Just after a quick review, I'd guess that the following that the following property is not configured correctly in your glog.properties file, as this parameter specifies the name of the Oracle Reports instance (and thus oc4j process) that OTM is calling to run the report.
Code:
p_reports_server=rep_otmrpt
This property will need to be set for all OTM servers and tiers (web and app).
Hope this helps!
--Chris